E-Mag And EMI

Question 1

Define magnetic flux

Answer 1

The magnetic flux through a plane surface is the product of the component of magnetic flux density normal to the surface and area of the surface.

Question 2

Define magnetic flux density

Answer 2

Magnetic flux density given at a point in a magnetic field is defined as the force per unit length exerted on a long straight conductor carrying a unit current that is placed perpendicular to the magnetic field.

Question 3

Define magnetic field

Answer 3

A magnetic field is a region of space in which a magnetic material, a current-carrying conductor or a moving charge located in it may experience a force.

Question 4

State Faraday’s Law

Answer 4

It states that the magnitude of emf induced is directly proportional to rate of change of magnetic flux linkage.

Question 5

State Lenz’s Law

Answer 5

It states that the e.m.f. is induced in the direction such as to oppose the change in the flux linkage that is inducing it.