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The plane of the coil of tangent galvanometer is kept parallel to magnetic meridian to

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increase the magnetic field due to current in the coil

make readings more accurate

avoid the influence of earth’s magnetic field

make earth’s magnetic field perpendicular to that due to current in the coil

answer is C.

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Detailed Solution

The plane of the coil of tangent galvanometer is kept parallel to magnetic meridian so that the angle between the magnetic field due to coil and the earth's horizontal magnetic field will be 90⁰ and tangent law can be applied.

$tanθ = B / B_{H}$

B - field due to coil , B_H - Horizontal component of earth's magnetic field

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