Question

the magnetic field lines are
1)open loop
2)closed loop
3)sometimes closedsometimes open
5)all of these​

Answer 1

Explanation:

The field lines starts (or diverges) from the positive charge and terminate (or converges) on negative charge. If the electric field lines form closed loop , these line must originate and terminate on the same charge which is not possible because electric field lines always moves from positive to negative.

Answer 2

Answer:

(2) Closed Loop

Explanation:

Magnetic lines form continuous closed loops because magnetic monopole does not exist in nature. We always find magnetic poles - North and South pole which are coupled together in such a way that field lines originating from one pole ends at the another loop, forming a closed loop.