First slide

combination of resistance

Question

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

Moderate

A

$1 Ω$
B

$2 Ω$
C

$3 Ω$
D

$7 Ω$

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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