please explain this..... quickly
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yes when electric current is passed through a circuit having compass needle , the needle deflects as when current passes through the wire some.magnetic effect is produced . compass needle also has a magnet fitting. due to which it deflects from its state of rest
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when the key is closed i.e. the circuit is completed the electricity flows through it. due to flow of current , magnetic field is created across conducting wire. As the magnetic needle is kept in this field it experiences some magnetic power which makes it to deflect.
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