In null method of comparison of magnetic moments, the net magnetic field at the centre of the DMM, when null deflection is obtained is

0

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B_{H}

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between

0

and

B_{H}

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above

B_{H}

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Solution

The correct option is B $B_{H}$
In null method , two magnets are kept on either side of the arms so that the net deflection is zero . So the magnetic field due to the bar magnets gets cancelled and only earth's horizontal magnetic field is left

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In null method of comparison of magnetic moments, the net magnetic field at the centre of the DMM, when null deflection is obtained is

The correct option is B BHIn null method , two magnets are kept on either side of the arms so that the net deflection is zero . So the magnetic field due to the bar magnets gets cancelled and only earth's horizontal magnetic field is left

The correct option is B $B_{H}$
In null method , two magnets are kept on either side of the arms so that the net deflection is zero . So the magnetic field due to the bar magnets gets cancelled and only earth's horizontal magnetic field is left