Question

The needle is deflected on passing an electric current through a metalic conductor.why?​

Answer 1

if u are talking about compass needle then
it gets deflected because of generation of magnetic field in conductor, when the current passes through conductor.
it's also know as electromagnetic field.
:-)hope it helps

Answer 2

I think you're taking about compass needle here so your answer is.

When current is passed by a metallic conductor then magnetic field forms around it. Thus compass needle gets deflected.

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