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Question

An ammeter A of finite resistance, and a resistor R re joined in series to an idea; cell C. A potentiometer P is joined in parallel to R. The ammeter reading is I0 and the potentiometer reading is V0. P is now replaced by a voltmeter of finite resistance. The ammeter reading now is I and the voltmeter reading is V.
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A
I>I0,V<V0
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B
I>I0,V=V0
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C
I=I0,V<V0
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D
I<I0,V=V0
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Solution

The correct option is A I>I0,V<V0
After connecting voltmeter the equivalent resistance of the circuit decreases. Thus the current in the circuit increases . So I>I0
Now the potential drop across ammeter +Potential drop across R = EMF of cell .
As current increasing through ammeter, the potential drop across ammeter increases. Hence potential drop across R decreases. So, V<V0

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