2. In the following figure a compass needle is kept parallel to a current carrying wire. (a) What will you observe when the current is switched on? hF (b) Justify your above observation with reason.
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The needle of a compass is a tiny magnet, which points in the north-south direction. When a magnet is brought close to it, the needle gets deflected. When an electric current passes through a wire, it behaves like a magnet. This magnetic effect of the electric current makes the compass needle deflect from the north-south direction.
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