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A rectangular coil $3cm×3cm$ consisting of 100 turns carries a current 0.1 A. It produces a deflection of10⁰, in a field of induction 0.1 T. The couple per unit twist is

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$0.9 N-m/degree$

$9 \times 10^{- 6} N-m/degree$

$9 \times 10^{- 5} N-m/degree$

$9 \times 10^{- 2} N-m/degree$

answer is B.

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Detailed Solution

$τ = 100 \times 9 \times 10^{- 4} \times 0.1 \times 0.1 = 9 \times 10^{- 4} Nm Complete per unit first = 9 \times 10^{- 4} /10 = 9 \times 10^{- 5} Nm/degree$

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