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Q.

In a Wheatstone's bridge, all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is

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a

$\frac{R}{2}$

b

R

c

2 R

d

$\frac{R}{4}$

answer is B.

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Detailed Solution

Since Wheatstone's bridge is balanced, then resistance of galvanometer will be unaffective.

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