Question

How do you conduct an experiment to show the magnetic field due to circular coil?

Answer 1

Hint

A current carrying circular coil produces a magnetic field. The magnetic field is more concentrated at the centre of the loop than outside the loop. The magnetic field lines are concentric circles at every point of the coil. Projection of these lines can be shown using iron filings on a flat board which has the wires passing through them.

Complete step-by-step solution
Take a conducting circular coil and connect a battery at the two ends of the coil as shown in the figure. At every section of the coil the direction of magnetic field lines can be found by using right hand thumb rule. At the centre of the loop the strength of the magnetic field is maximum and perpendicular to the plane of the coil. Each segment of the coil produces a magnetic field in the same direction. By putting a cardboard and powder of a magnetic material we can see the pattern as shown in the figure.

Note
Factors that affect the strength of magnetic field are:
1. The magnitude of the magnetic field is directly proportional to the current flowing in the coil.
2. The magnitude of the magnetic field is inversely proportional to the radius of the coil.