(P2)Magnetism Flashcards

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1
Q

Name 4 magnetic materials

A

Cobalt, steel, iron, nickel

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2
Q

What is a permanent magnet?

A

When a magnet has poles which are N and S all of the time (made from steel or magnadur) Produce their own magnetic field

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3
Q

How is an induced magnet magnetised? Give a use of a temporary magnet.

A

By bringing a permanent magnet near to it.

Electromagnets or circuit breakers

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4
Q

In a long straight conductor, what does the direction and strength of the magnetic field depend on?

A

Direction: direction of current
Strength: directly proportional to size of current, inversely proportional to distance from wire

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5
Q

What is a solenoid?

A

A coiled piece of wire used to produce a magnetic field, which is strong on the inside but weaker on the outside

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6
Q

How can the magnetic field strength inside the solenoid be increased?

A

Increase size of current, increase number of turns of wire on the coil, insert a magnetic material as the core

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7
Q

What is the motor effect?

A

When you put a wire (which has a magnetic field) into the magnetic field of another magnet the wire experienced a force called the motor effect

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8
Q

When is there no motor effect?

A

When the current is parallel to the magnetic field lines

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9
Q

How is the direction of force reversed in the motor effect?

A

If the current or field is reversed

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10
Q

What does the size of the force in the motor effect depend on?

A

The size of the field or current and the length of the conductor

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