The error due to imperfect centering of the pivot of the magnetic needle in the compass box in deflection magnetometer experiment is eliminated by taking the readings

without parallax

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by interchanging the arm of DMM

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at both ends of aluminium pointer

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by reversing the magnet

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Solution

The correct option is B at both ends of aluminium pointer
If the center is pivoted properly, then the angle made by the 2 pointers is noted and their average is taken to be the reading .

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The error due to imperfect centering of the pivot of the magnetic needle in the compass box in deflection magnetometer experiment is eliminated by taking the readings

The correct option is B at both ends of aluminium pointerIf the center is pivoted properly, then the angle made by the 2 pointers is noted and their average is taken to be the reading .

The correct option is B at both ends of aluminium pointer
If the center is pivoted properly, then the angle made by the 2 pointers is noted and their average is taken to be the reading .