P4 Magnetism amd its uses

What are the three magnetic materials?

Iron, Nickel, Cobalt

What happens when two like poles are placed next to/ in front of each other?

They repel

What happens when two unlike poles are placed next to/ in front of each other?

They attract

What is a field?

A region of space where an object will experience a force

If the magnetic field lines are close what does that mean?

The field is strongerand the force experienced is greater.

Where in a magnetic region will you experience the greatest force?

The poles

Which way do the field lines go?

From North to South

What is a soft magnetic material?

When the material is removed from the magnetic field its domains do not line up

What is a hard magnetic material

When the material is removed from the magnetic field its domains continue to be lined up

If the current is coming towards you (dot in the middle of a magnetic field) which way do the field lines go?

Anticlockwise

If the current is going away from you (cross in the middle of a magnetic field) which way do the field lines go?

Clockwise

What is a solenoid?

A coil of wire

What is the motor effect?

When a current flows through a wire in a magnetic field it can create a force that moves the wire. If they are at right angles the maximum force will be created.

What is the formula to calculate a force in a magnetic field?

B(magnetic strength(T)) x I x L(length of wire(m))

What is an electric motor?

A device that converts energy transferred electrically into kinetic energy

What happens when a wire moves through a magnetic field?

A potential difference is induced, if the circuit is complete there will be a current

What is Lenz’s Law

If a magnet is pushed into a coil, it induces a potential difference that causes a current that then produces a magnetic field. The field produced always opposes the change causing it by conservation of energy

What is a generator?

A device that converts kinetic energy into electrical energy