the needle is deflected on passing an electric current through a metallic conductor why
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The needle is deflected because Instead of being attracted by the magnetic field of the earth, it is attracted by the magnetic field created by the current flowing through the wire.
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Simple compass placed near the wire and middle of the middle by compass is deflected against the needle is deflected because instead of being attracted by the magnetic field of the earth It is being attracted by the magnetic field created by the current flowing through the wire
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