Magnetism I | Moving Coil Galvanometer All the best! 1. The coil of a moving coil galvanometer is wound over a metal frame in order to- reduce hysteresis increase sensitivity increase moment of inertia provide electromagnetic damping None 2. In a moving coil galvanometer, the deflecting torque τ acting on the coil is related to the current I flowing through it as- (A) τ ∝ I3 (B) τ ∝ I2 (C) τ ∝ I (D) τ ∝ √I Option (A) Option (B) Option (C) Option (D) None 3. Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity is 20 div/V. The resistance of the galvanometer is- 25 Ω 250 Ω 40 Ω 500 Ω None 4. The current sensitivity of a galvanometer increased by 20%. If its resistance also increases by 25%, the voltage sensitivity will- decrease by 1% increase by 5% increase by 10% decrease by 4% None 5. Assertion- On increasing the current sensitivity of a galvanometer by increasing the number of turns, may not necessarily increase its voltage sensitivity.Reason- The resistance of the coil of galvanometer increases on increasing the number of turns. Both Assertion and Reason are true and Reason is the correct explanation of Assertion Both Assertion and Reason are true but Reason is not the correct explanation of Assertion Assertion is true but Reason is false Both Assertion and Reason are false None 1 out of 5 Time's up
