7. Electrodynamics

Question 1

Magnetic flux linkage

Answer 1

The product of the number of turns on the coil and the flux through the coil.

Question 2

Faraday’s law

Answer 2

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

Question 3

Lenz’s law

Answer 3

The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux.

Question 4

Diode

Answer 4

A component that only allows current to flow in one direction.

Question 5

Threshold frequency

Answer 5

The minimum frequency of incident radiation at which electrons will be emitted from a particular metal.

Question 6

Work function

Answer 6

The minimum amount of energy needed to emit an electron from the surface of a metal.