Magnetic fields

Question 1

The radius of the circular path followed by charged particles

Answer 1

r = mv/BQ

Question 2

Frequency of rotation

Answer 2

f = v/2πr

Question 3

Frequency of rotation pt.2

Answer 3

f = v/2πr and r = mv/BQ
f = v/2π(mv/BQ)
f = BQ/2πm

Question 4

θ = ωt

Answer 4

Nψ = BANcos ωt

Question 5

Average power

Answer 5

Irms x Vrms

Question 6

Primary coil

Answer 6

Vp = Np

Question 7

Lenzs law

Answer 7

The induced EMF is always in such a direction as to oppose the change that caused it

Question 8

Faradays law

Answer 8

Induced EMF is directly proportional to the rate of change of flux linkage

Question 9

Define Magnetic Flux Density

Answer 9

The force on one meter of wire carrying a current of one amp at right angles to the magnetic field