The phosphor bronze strip is used in a moving | vedclass

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(A) In a moving coil galvanometer,the phosphor bronze strip is used as a suspension wire.The restoring torque per unit twist is known as the torsional

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Its torsional constant is small

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(A) In a moving coil galvanometer,the phosphor bronze strip is used as a suspension wire.The restoring torque per unit twist is known as the torsional constant $(k)$.For a sensitive galvanometer,we require a small restoring torque for a given deflection,which means the torsional constant $(k)$ should be as small as possible.Phosphor bronze has a very low torsional constant,which allows the coil to rotate even for very small currents,thereby increasing the sensitivity of the instrument.Additionally,phosphor bronze is non-magnetic and does not oxidize easily,making it ideal for this purpose.Therefore,the correct option is $A$.

The phosphor bronze strip is used in a moving coil galvanometer because

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