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Question

A wire seems to have charge flowing through it. When a compass is kept next to it, the needle gets deflected. The reason for the deflection is:

A
The charges force the needle into deflecting
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B
The flow of charges have an associated magnetic field
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C
The needle is loosely fit
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D
The needle has no deflection
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Solution

The correct option is B The flow of charges have an associated magnetic field
Flowing charges constitute an electric current. Now, we know that a current flowing through a conductor has a magnetic field associated with it. Hence, under the influence of that magnetic field, the needle of the compass gets deflected.

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