Current Electricity - Result Question 106

111. 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: 111. (d)

Solution:

  1. (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.