Magnetic Fields

Question 1

magnetic flux density

Answer 1

Force acting per unit current per unit length on a wire placed at right angles to the magnetic field

Question 2

Magnetic flux

Answer 2

number of magnetic field lines passing through an area

Question 3

Magnetic flux linkage

Answer 3

The amount of field passing through a coil of wire

Question 4

Tesla

Answer 4

unit of magnetic flux density

Question 5

Electromagnetic induction

Answer 5

The process of inducing an e.m.f in a conductor with relative motion to a magnetic field

Question 6

Faraday’s law of electromagnetic induction

Answer 6

the induced e.m.f is directly proportional to the rate of change of flux linkage

Question 7

Lenz’s law

Answer 7

the induced e.m.f is always in such a direction as to oppose the change that caused it

Question 8

Cyclotron

Answer 8

a type of particle accelerator which repeatedly propels a beam of charged particles (protons) in a circular path

Question 9

Domain theory

Answer 9

within a magnetic substance there are many domains of magnetic force each with a North and a South.

Question 10

Oscilloscope

Answer 10

electronic test instrument that graphically displays varying voltages of one or more signals as a function of time