Question

Experiment on magnetic field due to a current through a circular loop

Answer 1

The magnetic field lines are concentric circles at every point of a current carrying circular loop. The direction of magnetic field of every section of the circular loop can be found by using the right hand thumb rule. At the centre of the circular loop, The magnetic field lines are straight.

Answer 2

# take a rectangular cardboard having two holes

#insert a circular coil having large number of turns through them,normal to the plane of the cardboard

#connect the ends of the battery ,a key,and a rheostat

# sprinkle iron fillings uniformly on the cardboard

#plug the key

#tap the cardboard gently a few times

# you will observe that it form a clear circle near the wire ,and the shape of the circle reduces as it moves away from the wire