Magnetic Fields 🧲

Question 1

State Faraday’s law

Answer 1

The rate of change of magnetic flux linkage is directly proportional to the magnitude of induced E.M.F

Question 2

State Lenz’s law

Answer 2

The direction of electric current induced by a changing magnetic field is such that the magnetic field created by the induced electric current opposes changes in the original magnetic field

Question 3

Define magnetic flux

Answer 3

The product of cross sectional area and the component of the magnetic flux density perpendicular to the cross sectional area

Question 4

Define magnetic flux linkage

Answer 4

The product of magnetic flux and the number of turns in the coil

Question 5

How does the number of turns in the primary coil compare to the number of turns in the secondary coil in a step up transformer?

Answer 5

P<S

Question 6

How does the number of turns in the primary coil compare to the number of turns in the secondary coil in a step down transformer?

Answer 6

P>S