If the resistance R1 is increased,

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Question:
If the resistance R1 is increased, how will the readings of the ammeter and voltmeter change?

Solution:

IbR1 + Vbe = Vbb

Base current = Ib = Vbb – Vbe/R1

Ib is proportional to 1/R1

Therefore, when R1 is increased, Ib decreases.