Concepts Of Physics MCQ Edition [Volume 2]PhysicsPermanent Magnets

When the current is doubled, the deflection also doubles in

Options

Aa moving-coil galvanometer
Ba hot-wire ammeter
Ca moving-iron ammeter
Da tangent galvanometer

Correct answer

A. a moving-coil galvanometer

Step-by-step solution

For a moving-coil galvanometer, the deflecting torque is = NIAB and the restoring torque is _r = C . At equilibrium, NIAB = C I . Thus, when the current is doubled, the deflection also doubles. For a hot-wire ammeter and a moving-iron ammeter, the deflection I^2 . For a tangent galvanometer, the current I .

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