In metre bridge experiment, the resistance in the left gap is 15 $\Omega$ and in the right gap is 45 $\Omega$. The bridge is balanced. The distance of the null point from the centre of the wire is

Question

A galvanometer has resistance $ G = 100 \, \Omega $ and shows full-scale deflection at $ I_q = 1 \, \text{mA} $. To convert it into a voltmeter of range 5 V, what resistance should be connected in series?

Answer 1

Step 1: Wire ratio
Lengths are in the ratio of resistances: $l : (100 - l) = 15 : 45 = 1 : 3$.

Step 2: Position
So $l = 25$ cm from the left end.

Step 3: From centre
$50 - 25 = 25$ cm. Option (D).

Final Answer:
Option (D). \[ \boxed{25 \text{ cm}} \]

In metre bridge experiment, the resistance in the left gap is 15 \(\Omega\) and in the right gap is 45 \(\Omega\). The bridge is balanced. The distance of the null point from the centre of the wire is

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The Correct Option is D

Solution and Explanation

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