A small plotting compass can be used to plot a magnetic field because

the compass needle is freely suspended magnet

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the compass needle is easily demagnetized

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there is a vacuum inside the case of the compass

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the Earth's magnetic field has no effect on the needle

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Solution

The correct option is A the compass needle is freely suspended magnet
The compass needle acts as a freely suspended magnet which points in north-south direction under the influence of earth's magnetic field lines. So, a small plotting compass can be used to plot a magnetic field.

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A small plotting compass can be used to plot a magnetic field because

The correct option is A the compass needle is freely suspended magnetThe compass needle acts as a freely suspended magnet which points in north-south direction under the influence of earth's magnetic field lines. So, a small plotting compass can be used to plot a magnetic field.

The correct option is A the compass needle is freely suspended magnet
The compass needle acts as a freely suspended magnet which points in north-south direction under the influence of earth's magnetic field lines. So, a small plotting compass can be used to plot a magnetic field.