A compass needle deflects when kept next to an electric wire. The reason for the deflection is:

the flow of charges have an associated gravitational field

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the flow of charges have an associated magnetic field

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friction offered by flowing charges

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the charges force the needle into deflecting

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Solution

The correct option is B the flow of charges have an associated magnetic field
A static charge has an electric field associated with it. A moving charge has a magnetic field associated with it.
Flowing charges constitute an electric current. Now, we know that a current flowing through a conductor has a magnetic field associated with it.
Hence, due to the influence of that magnetic field, the needle of the compass deflects.

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