Question

A coil carrying electric current is placed in uniform magnetic field
A. Torque is formed
B. Emf is induced
C. Both A and B are correct
D. None of these

Answer 1

Hint:In this question we are given that the coil is kept in a field where the magnitude of the field is constant. To solve this question, we should have a basic understanding of torque, definition of emf. We know that torque is given as the product of force and radius.


Complete answer:

The magnetic flux through a magnetic component is determined by the number of magnetic field lines that pass across its cross-sectional region.
The number of lines passing through in one direction less the number of lines passing through in the opposing direction results in the net sum, which is what we are interested in here. The flux by an area element perpendicular to the magnetic field direction is determined by the product of the magnetic field and the area element. Magnetic flux is defined as a scalar product of the magnetic field and the area element vector.

According to Faraday's Law, when a current is flowing through a conductor with a finite number of turns, the rate at which the magnetic flux changes in the coil as a result is directly proportional to the induced EMF.

Since the magnetic field is constant, the flux will not vary, and there will be no induced emf. Magnetic dipole moment exists in a coil that carries current. As a result, it is subject to a torque in a magnetic field. Hence option A is correct.

Thus, the correct option is A.



Note:The force that drives an object around an axis is measured as torque. Force and torque are comparable. The torque drives the rotational acceleration, just as the force drives linear acceleration. Archimedes' use of levers to move objects gave rise to the idea of torque. The pivot point is the location around which an object revolves.