Which of the following statements is not true? (A) While taking reading of tangent galvanometer,...

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Which of the following statements is not true?
(A) While taking reading of tangent galvanometer, the plane of the coil must be set at right angles to the earth's magnetic meridian.
(B) A short magnet is used in a tangent galvanometer since a long magnet would be heavy and may not easily move.
(C) Measurements with the tangent galvanometer will be more accurate when the deflection is around \( 45^{\circ} \).
(D) A tangent galvanometer cannot be used in the polar region.
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