Electromagnetism & Electromagnetic induction definitions

Question 1

Magnetic field

Answer 1

A magnetic field is a region of space in which a moving charge or a current-carrying conductor or any ferromagnetic object will experience a magnetic force when it is placed in it. Hence, it is known as a field of force

Question 2

Magnetic flux density

Answer 2

The magnetic flux density of a magnetic field is numerically equal to the force per unit length per unit current acting on a long straight conductor at right angles to the magnetic field

Question 3

Tesla

Answer 3

A force of 1 newton acting on 1 meter of a long straight wire carrying a current of 1 ampere normal to the magnetic field

Question 4

Faraday’s law of electromagnetic induction

Answer 4

The induced emf is proportional to the rate of change of magnetic flux linkage

Question 5

Magnetic flux

Answer 5

The product of an area and the component of the magnetic flux density perpendicular to that area

Question 6

Magnetic flux linkage

Answer 6

The magnetic flux linkage of a coil is the product of the number of
turns of the coil, its area, and the magnetic flux density that passes
through its area perpendicularly.

Question 7

Lenz’s law

Answer 7

The direction of induced emf is such as to cause effects to oppose the change producing it

Question 8

Weber

Answer 8

A weber is the magnetic flux through an area if a magnetic flux density of one tesla exists at right angles to an area of 1 squared meter

Question 9

Eddy currents

Answer 9

Eddy currents are loops of induced current that circulate in a conductor of extended size when there is a change in magnetic flux linkage through the conductor