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A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 450. If the current be reduced by a factor of 3, the deflection (in degree) would decrease by

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answer is 15.

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Detailed Solution

In tangent galvanometer, I∝tanθ∴I1I2=tanθ1tanθ2 ⇒I1I1/3=tan450tanθ2⇒θ2=30∘ So, deflection will decrease by 45∘−30∘=15∘

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