The coil of a moving coil galvanometer has an effective area of 4 x 10^-2 m². It is suspended in a magnetic field of 5 x 10^-2 Wbm^-2. If the deflection in the galvanometer coil is 0.2 rad when a current of 5 mA is passed through it, then

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current sensitivity is 40 degree A^-1

torsional constant is 3x10^-3 N-mrad^-1

current sensitivity is 4 rad A^-1

torsional constant is 5x10^-5 N-mrad^-1

answer is A.

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Detailed Solution

$C θ = B i A N$

$\Rightarrow C = \frac{4 \times 10^{- 2} \times 5 \times 10^{- 2} \times 5 \times 10^{- 3}}{0.2} = 5 \times 10^{5} N - m r a d^{- 1}$

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