Question

when the current is switched on through a connecting wire the needle of compass got deflected from its north to south position explain

Answer 1

When a current flows it affects the magnetic field of the magnet and this causes the magnetic needle to change its position from north to south

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.