Question

when the current is switched on through a wire a compass needle kept nearly gets defected from it North or South position explain it please fast

Answer 1

when current start to flow through a wire due to magnetic effects of current it possess some magnetic field lines . when these field lines came in contact with compass it experiences magnetic effects and get defflected

Answer 2

Answer:

When current is passed through the coiled wire, it deflects the compass near it from its north-south position like a magnet. This is called magnetic effect of the current. As we know that needle of the compass is made up of a thin magnet. When this needle comes in contact with another magnet then the like poles of the magnet repel each other and opposite poles attract each other. So the deflection is seen in the needle. In this case the wire behaves like a magnet and causes deflection in needle of the compass.