A tangent galvanometer shows a deflection \( 45^{\circ} \) when \( ...

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A tangent galvanometer shows a deflection \( 45^{\circ} \) when \( 10 \mathrm{~mA} \) current pass through it. If the horizontal
\( \mathrm{P} \) component of the earth's field is \( 3.6 \times 10^{-5} \mathrm{~T} \) and
\( \mathrm{W} \) radius of the coil is \( 10 \mathrm{~cm} \). The number of turns in the coil is
(1) 5700 turns
(2) 57 turns
(3) 570 turns
(4) 5.7 turns
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