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For what value of R, current in the galvanometer is zero?

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$1 Ω$

$2 Ω$

$3 Ω$

$7 Ω$

answer is A.

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Detailed Solution

Potential difference across resistance R equals 2 V with polarity as shown.

Hence,current $i = \frac{12 - 2}{5} = 2 A$

So, 2 x R = 2

$R = 1 Ω$

Hence, choice (1) is correct.

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