Physics 2 magnetism , motor effect and electromagnetic induction

Question 1

How to test the symbols on the magnet

Answer 1

Use a compass place next to magnet place next to south if arrow pointing to south that is south if north arrow facing away
Do this over create the field lined

Question 2

What is a permanent magnet

Answer 2

Magnets that produce there own magnetic field all the time

Question 3

What is an induced magnet

Answer 3

There magnetic field is temporary
When a non magnetic material is put in the field of a magnet

Question 4

What is electromagnetism

Answer 4

Electric currents produce there own magnetic field

Question 5

What is the right hand rule

Answer 5

Point your thumb in direction. The current is flowing
The direction you fingers are curling they’ll you the direction of magnetic field

Question 6

What is a solenoid

Answer 6

Emecltromagnet formed by a coil of wire , generates magnetic field
Produce a uniform magnetic field

Question 7

How to reverse the direction of magnetic field

Answer 7

Change the current

Question 8

How to increase electromagnetic strength

Answer 8

Increase the current that flows through solenoid
Increase number of turns in a coil density packed
Add a iron core will become a induced magnet

Question 9

What is the motor effect

Answer 9

Current carrying wire in the presence of a magnetic field will experience a force

Question 10

Motor effect , use Flemings left hand rule

Answer 10

First finger forward , direction of magnetic field
Second finger pointing out , current
Thumb up ,direction of force

Question 11

How does electro motor work

Answer 11

The force creates a torque on a loop of wire in the magnetic field which cause the motor to spin

Or
Electric current passing through the wire cause the magnetic field to exert a force turning the rotor

Question 12

How are transformers used

Answer 12

Used in national grid
Power station
Use step up transformer increase v to 400000 minimise energy loss
Goes through wires and pylons
Once gets to town goes ghrough step down transformer to 230 v so it’s safe to use

Question 13

What is a transformer

Answer 13

Used to increase and decrease voltage

Question 14

How transformers work

Answer 14

An iron core wrapped with primary and secondary coil
An alternation voltage is applied to the primary coil cause current to flow generates magnetic field
Current and field will alternate
Induces magnetic field in iron core
Transfers current from primary to secondary use if induced fields