question_answer

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

A)  \[\frac{R}{2}\]                         

B)  R

C)  2 R                             

D)  \[\frac{R}{4}\]

Correct Answer: B

Solution :

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