In the following, the most sensitive method to compare the magnetic moment of two bar magnets with a deflection magneto-meter is

tan A

null method

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tan A

equidistant

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tan B

equidistant

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tan B

null method

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Solution

The correct option is C $tan A$ null method
Tan A position is preferred to $tan B$ position because for the same distance between the centre of the needle and deflection magnetometer deflection is more in $tan A$ position $($ the field is more on axial line then equatorial line $)$
Also null deflection method is preferred to equidistant method.

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