Motion of Charged Particle in a Magnetic Field | Moving Charges and Magnetism Class 12, JEE & NEET
When a charged particle moves along a magnetic field line into a region where the field becomes stronger, the particle experiences a force that reduces the component of velocity parallel to the field. This force slows the motion along the field line and here reverses it, forming a Magnetic Mirror. The motion of a charged particle in a magnetic field is characterized by the change in the direction of motion. It is expected also as the magnetic field is capable of only changing the direction of mo...
Read More →Torque on a Current loop in a Magnetic Field || Moving Charges and Magnetism - Class 12, JEE & NEET
Without torque, there would be no twists and turns, no spins! Wouldn’t life be boring that way? Torque gives a rotational motion to an object that would otherwise not be possible. So here we will study about Torque and Torque on a Current loop in a Magnetic Field in detailed derivation. Torque Experienced by a Current Loop in a Uniform Magnetic Field Let us consider a rectangular current loop PQRS of sides a and b suspended vertically in a uniform magnetic field. $\overrightarrow{\mathrm{B}}$. L...
Read More →Flemings Left Hand Rule Class 12 Physics - eSaral
Flemings Left Hand Rule Class 12 states that if we stretch the thumb, the forefinger, and the middle finger of our left hand such that they are mutually perpendicular to each other. If the forefinger gives the direction of current and the middle finger points in the direction of the magnetic field then the thumb points towards the direction of the force or motion of the conductor. Then if the forefinger points in the direction of field $(\overrightarrow{\mathrm{B}})$, the central finger in the d...
Read More →Force on a Current-Carrying Conductor in Magnetic field - Class 12, JEE & NEET
Force on a Current-Carrying Conductor in Magnetic field A current-carrying conductor produces a magnetic field around it. i.e. Behaves like a magnet and exerts a force when a magnet is placed in its magnetic field. Similarly a magnet also exerts equal and opposite force on the current-carrying conductor. The direction of this force can be determined using Flemings left-hand rule. Current Element Current element is defined as a vector having a magnitude equal to the product of current with a smal...
Read More →Solenoid and Toroid | Difference between Solenoid and Toroid
A toroid works as an inductor, which boosts the frequency to appropriate levels. Inductors are electronic components that are passive so that they can store energy in the form of magnetic fields. A toroid turns, and with those turns induces a higher frequency. Toroids are more economical and efficient than solenoids. So here we will study in detail about solenoids and Toroids and the differences between both. Solenoid Toroids Difference between Solenoid and Toroid Similarities Between Solenoid a...
Read More →Magnetic Field of a Solenoid || Class 12 Physics Notes
The Solenoid is a coil of wire that acts like an electromagnet when a flow of electricity passes through it. Electromagnetic solenoids find use all over the world. You can hardly swing a bat without hitting a solenoid. Speakers and microphones both contain solenoids. In fact, a speaker and microphone are pretty much exactly the same things in reverse of each other. So here we will study in detail about Magnetic Field of a Solenoid Derivation in this article: Magnetic Field of a Solenoid A soleno...
Read More →Ampere's Circuital Law and it Applications || Magnetic Effects of Current Class 12
Do you know about the Ampere's Circuital Law, well it is a current distribution that helps us to calculate the magnetic field, And yes, Biot-Savart's law does the same but Ampere’s law uses the case high symmetry. We will first understand the ampere’s circuital law, its definition, formulae, Applications of Ampere's Law in detail, What is Ampere’s Circuital Law? Application of Ampere's Circuital Law Magnetic induction due to a long current-carrying wire. The Magnetic field created by a long curr...
Read More →Magnetic Field at the Centre of a Circular Coil | Circular Current loop as a Magnetic Dipole
Here we will study about the Magnetic Field at the Centre of a Circular Coil. Here we will study about the number of cases Magnetic Field at the Centre of a Circular Coil Magnetic dipole moment of the current loop Magnetic Field at the Center of a Circular Current-Carrying Coil Consider a circular coil of radius r through which current I is flowing. Let AB be an infinitesimally small element of length d\ell. According to Biot-Savart's law, the magnetic field dB at the center P of the loop due to...
Read More →Helmholtz Coils | Magnetic Field between two Coils | eSaral
Helmholtz coil is named after the German physicist Hermann von Helmholtz. It is comprised of two identical magnetic coils positioned in parallel to each other, and their centers are aligned in the same x-axis. The two coils are separated by a distance equal to the radius like a mirror image as shown in Figure 1. When current is passing through the two coils in the same direction, it generates a uniform magnetic field in a three-dimension region of space within the coils. Helmholtz coils are norm...
Read More →Right Hand Palm Rule - Magnetic Effect of Current Class12, JEE & NEET
So far we have described the magnitude of the magnetic force on a moving electric charge, but not the direction. The magnetic field is a vector field, thus the force applied will be oriented in a particular direction. There is a clever way to determine this direction using nothing more than your right hand. The direction of the magnetic force $F$ is perpendicular to the plane formed by $v$ and $B$, as determined by the right-hand palm rule, which is illustrated in the figure. The right-hand rule...
Read More →Mind Map of Vectors (Part 2) Physics Class 11, JEE & NEET-Download from here
Learn all the formulas and important topics of Vectors through this mind map. Download Mind Map...
Read More →Magnetic Field due to Infinite Straight Conductor | Magnetic Effects of Current Class 12
Hey, do you want to learn about the Magnetic Field due to Infinite Straight Conductor? If yes. Then keep reading. Magnetic field due to long straight conductor Here we will discuss all the cases involved in the magnetic field due to Conductor such as Magnetic Field due to Infinite Straight Conductor, and many more discussed below: Consider a long straight conductor XY through which current I is flowing from $X$ to Y. Let $P$ be the observation point at a distance 'r' 'from the conductor XY. Let ...
Read More →Right hand Thumb Rule in Physics Class 12 | Magnetic Effects of Current
The right-hand thumb rule in Physics states that: to determine the direction of the magnetic force on a positive moving charge,ƒ, point the thumb of the right hand in the direction of v, the fingers in the direction of B, and a perpendicular to the palm points in the direction of F. Right-Hand Thumb Rule: If we grasp the conductor in the palm of the right hand so that the thumb points in the direction of the flow of current, then the direction in which the fingers curl, gives the direction of ma...
Read More →Magnetic Effect of Electric Current Class 12 Notes | Introduction
The electricity and magnetism are linked to each other and it is proved when the electric current passes through the copper wire, it produces a magnetic effect. The electromagnetic effects first time noticed by Hans Christian Oersted. Oersted discovered a magnetic field around a conductor carrying an electric current. The magnetic field is a quantity, which has both magnitude and direction. The direction of a magnetic field is usually taken to be the direction in which, a north pole of the compa...
Read More →Rotational Motion Revision Video - Class XI, JEE, NEET
The Revision series is designed for all JEE NEET aspirants to provide quick revision of all the chapters of Class 11th 12th with important key concepts. The revision videos help you make the best use of your limited time left for revision. It is especially time-saving for all students who are going to appear for 12th Board. When you don’t have time to go through chapter notes in detail, learn and revise most important key concepts and formulae here. PART 1 Saransh Sir will be covering the follow...
Read More →Mind Maps for Rotational Motion: Angular Momentum Revision - Class XI, JEE, NEET
Rotational Motion Class 11 comprises variety of cases with important formulae and key points. So here is the mind map to help you in remembering all the key formulae and important concepts on finger tips. Download...
Read More →Ammeter and Voltmeter Circuit Diagram | Current Electricity Class 12, JEE & NEET
Voltmeters and ammeters are used to measure voltage and current, respectively. Here we will discuss both with Ammeter and Voltmeter Circuit Diagram. India's Best Exam Preparation for Class 12th - Download Now Ammeter Voltmeter Ammeter An ammeter is a low resistance galvanometer used to measure strength of current in an electrical circuit. An ammeter is always connected in series in a circuit because when an ammeter is connected in series it does not appreciably change the resistance of circuit a...
Read More →Post Office Box Physics || Current Electricity Class 12, JEE & NEET
A Post Office Box can also be used to measure an unknown resistance. It is a Wheatstone Bridge with three arms P, Q and R; while the fourth arm(s) is the unknown resistance. P and Q are known as the ratio arms while R is known as the rheostat arm. Post Office Box, Physics named it so because it has a shape of box and was designed to find resistance of electric cables and telegraph wires. It was used in post offices to determine resistance of transmission lines. At balance, the unknown resistance...
Read More →Moving Coil Galvanometer Class 12
Ever wondered how the utility company detects how much power is used each month? The galvanometer is an instrument used to determine the presence, direction, and strength of an electric current in a conductor. Here we will study about the Galvanometer, moving Coil Galvanometer class 12 and its types. These are instruments used for detection and measurement of small currents. Moving Coil Galvanometer Types of Moving Coil Galvanometer Current Sensitivity of a Galvanometer Voltage Sensitivity of a ...
Read More →Wheatstone Meter Bridge - Circuit Diagram || Current Electricity Class 12, JEE NEET
A Meter Bridge also called a slide wire bridge is an instrument that works on the principle of a Wheatstone bridge. A Wheatstone meter bridge is used in finding the unknown resistance of a conductor as that of in a Wheatstone bridge. The wire is made of manganin because they have low temperature coefficient and large resistivity. The wires are soldered to two thick L shaped copper strips with binding terminals. Between these there is a third copper strip. There are two fixed gaps ab and cd. (1) ...
Read More →Wheatstone Bridge Circuit Diagram, Applications, Formula - Class 12, JEE & NEET
Wheatstone Bridge Principle of Wheatstone Bridge Balanced Wheatstone Bridge Unbalanced Wheatstone Bridge Applications of Wheatstone Bridge Kelvin's Double Bridge The Wheatstone Bridge circuit is nothing more than two simple series-parallel arrangements of resistances connected between a voltage supply terminal and ground producing zero voltage difference between the two parallel branches when balanced. Here we will study about, Wheatstone Bridge, the Conditions of balanced and Unbalanced Wheatst...
Read More →Kelvin Bridge - Definition and Diagram || Current Electricity Class 12, JEE & NEET
The Kelvin bridge or Thompson bridge is used for measuring the unknown resistances having a value less than 1Ω. It is the modified form of the Wheatstone Bridge. Here we will study about Kelvin Bridge, its Diagram and the equation of Kelvin Bridge. Why there is a requirement of Kelvin Bridge? Wheatstone bridge use for measuring the resistance from a few ohms to several kilo-ohms. But error occurs in the result when it is used for measuring the low resistance. This is the reason because of which ...
Read More →Uses of Potentiometer | Comparison of emf of two cells using Potentiometer || Class 12, JEE & NEET
The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential (voltage); the component is an implementation of the same principle, hence its name. Potentiometer are commonly used to control electrical devices such as volume controls on audio equipment. We will study here about Comparison of emf of two cells using Potentiometer, Determination of internal resistance of cell, Calibration of voltmeter, Calibration of ammeter, Measurement of sm...
Read More →Sensitivity of Potentiometer - Current Electricity || Class 12, JEE & NEET
Sensitivity of Potentiometer means the smallest potential difference it can measure. It can be increased by reducing the potential gradient. A potentiometer is sensitive if it is capable of measuring the small potential differences and it shows significant change in balancing length for a small change in the potential difference being measured. Sensitivity of Potentiometer means the smallest potential difference that can be measured by using it and this can be achieved by decreasing the potentia...
Read More →Class 12 Potentiometer Questions for NEET | JEE
Here are the Potentiometer Questions for NEET, IIT JEE and Board Exams. Potentiometer Questions for NEET, IIT JEE and Board Exams Ex. In the primary circuit of a potentiometer a battery of $2 \mathrm{V}$ and a rheostat of $22 \Omega$ are connected. If the length of potentiometer wire is $10 \mathrm{m}$ and its resistance is $18 \Omega$ then find the potential gradient in wire. Sol. The potential gradient $x=\left(\frac{E}{r+R+R_{h}+R_{e}}\right) \frac{R}{L} \quad r=R_{e}=0 \Omega$ So $x=\left(\f...
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