Chapter 6 - Electromagnetism

Question 1

What is the strength of the magnetic field of a solenoid determined by?

Answer 1

1. No. of turns in solenoid
2. Current through solenoid
3. Type of sub. core metal placed in solenoid is made of.

Question 2

What is electromagnetic induction?

Answer 2

Phenomenon where an emf, as well as an electrical current is induced in a conductor by an altered magnetic field around the conductor.

Question 3

What are the factors influencing the magnitude of the emf in electromagnetic induction?

Answer 3

1) Strength of magnet
( stronger magnet = stronger mag. field + larger induced emf )

2) No. if turns
( more turns = larger induced emf & current )

3) Speed at which magnet / solenoid moves
( faster = larger induced emf & current )

Question 4

What is magnetic flux?

Answer 4

The product of the perpendicular component of the mag. field through a surface, & the size of the surface.

Question 5

What is Faraday’s Law of electromagnetic induction?

Answer 5

The magnitude of the emf induced in a coil is directly proportional to rate of change of the magnetic flux.

Question 6

What is Lenz’s Law?

Answer 6

The induced current is as such that it opposes that which cause it.