A battery of emf 12 V and internal resistance 2 is connected in series with a tangent galvanometer of resistance 4 . The deflection is 60^ when the plane of the coil is along the magnetic meridian. To get a deflection of 30^ , the resistanc

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A battery of emf 12 V and internal resistance 2 is connected in series with a tangent galvanometer of resistance 4 . The deflection is 60^ when the plane of the coil is along the magnetic meridian. To get a deflection of 30^ , the resistance to be connected in series with the tangent galvanometer is

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Correct answer: A. 12

I=k , k being reduction factor and I 1 R aligned & R+r (R+r)+R^ = ^ & 4+2 6+R^ = 30^ 60^ & R^ =12 aligned

A battery of emf 12 V and internal resistance 2 is connected in series with a tangent galvanometer of resistance 4 . The deflection is 60^ when the plane of the coil is along the magnetic meridian. To get a deflection of 30^ , the resistance to be connected in series with the tangent galvanometer is

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