A moving coil sensitive galvanometer shows a | vedclass

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(C) To control the speed of deflection and bring the coil to rest quickly,electromagnetic damping is required. This is achieved by winding the coil on

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$A$ small copper wire should be connected across its terminals

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(C) To control the speed of deflection and bring the coil to rest quickly,electromagnetic damping is required. This is achieved by winding the coil on a non-magnetic metallic frame (usually copper). When the coil moves,eddy currents are induced in the metallic frame,which oppose the motion of the coil,thereby providing the necessary damping. Thus,connecting a small copper wire across its terminals or using a metallic frame provides the required damping effect. Among the given options,connecting a low resistance (like a copper wire) across the terminals creates a closed circuit for eddy currents,providing damping.

$A$ moving coil sensitive galvanometer shows a large deflection. To control its speed of deflection (damping),which of the following is used?

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$A$ galvanometer,whose resistance is $50\, \Omega$,has $25$ divisions. When a current of $4 \times 10^{-4}\, A$ passes through it,its needle deflects by one division. To use this galvanometer as a voltmeter of range $2.5\, V$,it should be connected to a resistance of ....... $\Omega$.

Give the unit of shunt.

The sensitivity of a galvanometer that measures current is decreased by $\frac{1}{40}$ times by using a shunt resistance of $10 \Omega$. Then,the value of the resistance of the galvanometer is (in $Omega$)

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