In a moving coil galvanometer, a coil of area 5 cm2 having 100 turns carrying a current of 0.5 ×10−4 amp is suspended in a magnetic field of induction 0.2 T. deflects through an angle of 200. The couple per unit twist is

2.5 × 10 − 5 N − m / degree

2.5 × 10 − 8 N − m / degree

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In a moving coil galvanometer, a coil of area 5 cm² having 100 turns carrying a current of $0.5 \times 10^{- 4}$ amp is suspended in a magnetic field of induction 0.2 T. deflects through an angle of 20⁰. The couple per unit twist is

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$2.5 \times 10^{- 5} N - m / degree$

$5 \times 10^{- 5} N - m / degree$

$2.5 \times 10^{- 8} N - m / degree$

$5 \times 10^{- 8} N - m / degree$

answer is B.

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$C θ = B i N A$

$C = \frac{N i A B}{θ}$

$C = \frac{5 \times 10^{- 4} \times 100 \times 0.5 \times 10^{- 4} \times 0.2}{20}$

$C = 2.5 \times 10^{- 8}$

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