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Question
If the resistance R1 is increased (Figure), how will the readings of the ammeter and voltmeter change?
Solution
Let us redraw the circuit diagram to find the change in reading of the ammeter and voltmeter.
So, `I_BR_1 + V_(BE) = V_(BB)`
Base current, `I_B = (V_(BB) - V_(BE))/R_1`
`I_B ∝ 1/R_1`
So, R1 is increased, IB is decreased.
Now, the current in the ammeter is collector current IC.
IC = βIB as IB is decreased, IC is also decreased and the reading of the voltmeter and ammeter also decreased.
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