Question:
The work done to move a charge along an equipotential from A to B
(a) cannot be defined as
$-\int_{A}^{B} E . d l$
(b) must be defined as
$-\int_{A}^{B} E . d l$
(c) is zero
(d) can have a non-zero value
Solution:
The correct answer is
(b) must be defined as
$-\int_{A}^{B} E . d l$
(c) is zero