Physics
What will happen to a compass needle when the compass is placed below a wire and a current is made to flow through the wire? Give a reason to justify your answer.
Electro-Magnetism
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Answer
When current is made to flow through the wire, a magnetic field is produced around it. When the compass needle is placed below the wire, it experiences a torque due to this magnetic field. So it deflects to align itself in the direction of magnetic field.
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