Which of the following statement is not the 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 ${45^o}$

  • D

    A tangent galvanometer can not be used in the polar region

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