The effect of current causes deflection in a compass needle when it is placed near a current-carrying wire.

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Solution

The correct option is B magnetic
The compass needle consists of a pivoted magnet which is free to rotate. When the compass is placed near a current-carrying wire, magnetic effect of current causes a deflection from its usual north–south position.

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The needle of a compass does not deflect when it is brought near a current carrying conductor.

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