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  • For a moving coil galvanometer, the deflection in the coil is rad when a current of <img alt="10 mA" src="https://entra

For a moving coil galvanometer, the deflection in the coil is 0.05 rad when a current of 10 mA is passed through it. If the torsional constant of suspension wire is 4.0 \times 10^{-5} N m  rad ^{-1} , the magnetic field is 0.01 T and the number of turns in the coil is 200 , the area of each turn (in cm^{2}) is :

Option: 1

1.0


Option: 2

2.0


Option: 3

1.5


Option: 4

0.5


Answers (1)

best_answer

\begin{aligned} & \theta=\frac{N B A}{C} I \\ & A=\frac{\mathrm{C} \theta}{\mathrm{IBN}} \\ & =\frac{4 \times 10^{-5} \times .05}{10 \times 10^{-3} \times 0.01 \times 200} \\ & \mathrm{~A}=10^{-4} \mathrm{~m}^2 \\ & =1 \mathrm{~cm}^2 \end{aligned}

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Divya Prakash Singh

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