Question

Draw the magnetic field line due to current through a circular loop.

Answer 1

Hint:The right-hand thumb rule has to be used to find the direction of magnetic lines. Concentric circles are formed at every point when current flows in a circular loop which is called the magnetic lines. They represent the magnetic field. More the number of closed lines is, the more the field intensity.

Complete step-by-step solution:
Magnetic forces act at a distance; we define a magnetic field to represent magnetic forces. To identify the strength and direction of the magnetic field lines are useful. The direction of magnetic field lines is defined to be the direction in which the north ends of a compass needlepoint. The magnetic field is traditionally called the B-field.
The magnetic lines will be straight at the center of the loop because at any other point inside the circle would be closer to one point as compared to the other but at the center, all the points in the loop are at equal distance to each other.
The current flowing at each segment of the loop produces magnetic lines in the same direction within the loop.
The direction of the magnetic field is perpendicular to the place of the coil (along the axis of the coil) at the center.
The below diagram shows the magnetic line (dotted) due to current flowing in the circular loop.

Note:Field Lines cannot cross and they are continuous loops. The magnetic field is always tangent to the magnetic field lines. The density of the lines formed is proportional to magnetic field density. Outside the magnet, lines start from the north pole to the south pole and inside they move from south to north.