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Question

In the circuit shown the readings of ammeter and voltmeter are 4 A and 20 V respectively. The meters are non-ideal, then R is :


A
5 Ω
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B
less than 5 Ω
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C
greater than 5 Ω
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D
between 4 Ω & 5 Ω
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Solution

The correct option is C greater than 5 Ω
Given:
i=4 A; V=20 V


From diagram,

R=Vi1=20i1

i1=20R

Since, voltmeter is non- ideal, so some current will also passes through it.

i1<4 A

20R<4R>5 Ω

Hence, option (c) is the correct answer.

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