Question

What is the direction of the magnetic field at the center of a coil carrying current in a clockwise direction?
(A). Along the axis of coil inwards
(B). Along the axis of coil outwards
(C). Perpendicular to the axis of coil inwards
(D). Perpendicular to the axis of coil outwards

Answer 1

Hint: We will use the right-hand thumb rule given by Maxwell in order to solve this question. The rule says that- If the thumb, the forefinger, and the middle finger of the right hand are bent at right angles to one another with the thumb pointed in the direction of motion of a conductor relative to a magnetic field and the forefinger in the direction of the field, then the middle finger will point in the direction of the induced electromotive force.

Complete step by step answer:
After applying the rule in the situation given by the question, we will have-
When the current passes through the coil, the direction of magnetic field at the center is along the axis of the coil. At the other points of coil inside and beyond the magnetic field is small and appears to diverge.
When the current flows through the solenoid in the clockwise direction, then the magnetic lines of force inside or at the center of the coil will be along the axis inwards according to right hand thumb rule.
Thus, option A is the correct option.

Note:
Magnetic field, a vector field in the area of a magnet, electric current, or changing electric field, in which magnetic forces are recognizable. Magnetic fields, for example, that of Earth cause magnetic compass needles and other permanent magnets to arrange toward the field.