The diagram below shows a magnetic needle

Electricity and Magnetism (10)

The diagram below shows a magnetic needle kept just below the conductor AB which is kept in North South direction.

1. In which direction will the needle deflect when the key is closed?
2. Why is the deflection produced?
3. What will be the change in the deflection if the magnetic needle is taken just above the conductor AB?
4. Name one device which works on this principle.

Answer

(i) Towards east

(ii) Magnetic effect of current

(iii) Deflection in the opposite direction / towards west

(iv) Electric Bell, Electromagnet