Magentism And Electronagentsuim

Question 1

Which bit of the magnetic are the forces the strongest

Answer 1

The poles

Question 2

What’s the difference between a permanent magnet and a induced magnet

Answer 2

Permanent Produces its own magnetic field
Induced magnet becomes magnetic when place to the magnetic field

Question 3

Examples of magnetic materials

Answer 3

Iron
Steel
Cobalt

Question 4

What happens when an electrical conductor moves relative to magnetic field

Answer 4

A potential difference is induced

Question 5

Two ways that generator effect is used to generate current

Answer 5

Alternator to produce alternating current
Dynamo to produce direct current

Question 6

How do transformers work

Answer 6

AC flows through Primary coil
Induces a changing magnetic field in the core
This induces current to flow in secondary coil

Question 7

What is an electromagnet

Answer 7

A solenoid with an iron core

Question 8

In a step up the ……… coil has more turns and therefore higher PD

Answer 8

Secondary

Question 9

If coils in transformers have same number of turns it’s

Answer 9

100% Effiecent no wasted energy

Question 10

Only …… current can produce induced PD …. Because

Answer 10

Alternating
Needs to change direction of magnetic field

Question 11

In dynamos PD is never

Answer 11

Negative because split ring commutators switch’s current

Question 12

Magnetic fields run from

Answer 12

North to south

Question 13

When wire in alternator is vertical pd is

Answer 13

0

Question 14

Potential difference is only induced

Answer 14

When moving through magnetic field

Question 15

Left hand rule

Answer 15

Thumb is force
Finger field
Finger current