A compass placed in an electric field will be deflected due to:

heating effect of current

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magnetic effect of current

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conducting effect

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resistance of the needle to the electric field

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Solution

The correct option is B magnetic effect of current
An electric current causes a magnetic field around it just like a magnet causes a magnetic field. When you moved the compass near an electric field, the magnetic field produced due to the electric field deflects the compass.

Hence, the correct option is $B$

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