Current Electricity Ques 15
15. 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
[2003]
(a) $2 R$
(b) $\frac{R}{4}$
(c) $\frac{R}{2}$
(d) $R$
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Answer:
Correct Answer: 15.(d)
Solution:
- (d) Since, Wheatstone’s bridge is balanced, then resistance of galvanometer will be uneffective.
Wheat stone bridge is most sensitive if all the arms of bridge have equal resistances.
BETA
