Q. In a circuit for finding the resistance of a galvanometer by half deflection method, a battery and a high resistance of are used. The figure of merit of the galvanometer is division. In the absence of shunt resistance, the galvanometer produces a deflection of divisions when current flows in the circuit. The value of the shunt resistance that can cause the deflection of , is closest to :

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Solution:

Current required by unit deflection is
For, current is

Let is resistance of galvanometer. Then,






Also in half deflection method,