6.6 electromagnetism

Question 1

define magnetic flux density

Answer 1

the magnetic flux density of a magnetic field is defined as the magnetic force per unit current per unit length acting on a straight current-carrying conductor placed perpendicular to a uniform magnetic field

Question 2

define magnetic flux

Answer 2

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

Question 3

define magnetic flux linkage

Answer 3

magnetic flux linkage is the product of the magnetic flux passing through the coil and the number of turns on the coil

Question 4

state Faraday’s law

Answer 4

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

Question 5

state Lenz’s law

Answer 5

Lenz’s law states that the induced current is in a direction to produce effects which oppose the change in magnetic flux linkage

Question 6

define rms current in an alternating circuit

Answer 6

the value of a steady direct current which would dissipate heat at the same average rate in a given resistor