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Physics > P13 Electromagnatism > Flashcards

P13 Electromagnatism Flashcards

1
Q

What do all magnets have?

A

Two poles which produce a magnetic field

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2
Q

Which way do magnetic lines always travel?

A

North to south

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3
Q

Shere is the magnetic field the strongest?

A

The poles

When you are closer to the magnet

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4
Q

What is the force between magnets?

A

The force is always attractive

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5
Q

What happens when 2 poles of the same meet?

A

They rebel each other

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6
Q

What happens when two poles of the same meet?

A

They attract

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7
Q

What is a feature of permenant magnets?

A

They produce there own magnetic field

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8
Q

What are induced magnets?

A
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9
Q

What haopens to an induced magnet if it’s magnetic field is taken away?

A

It quickly looses it’s magnetic field

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10
Q

What happens when a current flows through a wire?

A

An magnetic field is created around the wire

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11
Q

How can you change the direction of the magnetic field?

A

Changing the direction of the current

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12
Q

What is the Right-Hand thumb rule?

A

Using your right hand you point yout thumb in the direction of the current and the way in chich your finders are pointing is the direction of the magnetic field

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13
Q

What is a solenoid?

A

A coil of wire

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14
Q

How can you increase the strength of a magnetic field?

A

Increased the amount of coils as they will then be closer together

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15
Q

How may you increase the power of a solenoid?

A

Core - using an iron core
Coils - increasing the number of coils
Currnet - increasing the currnet

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16
Q

What happens when a current-carring wire is put between magnetic poles?

A

The magnet and the conductor exters a force on each other - this causes the wire to move

17
Q

What is the motor effect?

A

The reason why a wire moves when it is placed between two magnetic poles

18
Q

When will a wire experience the most force in the motor effect?

A

When it is at 90 degrees (perpendicular)

19
Q

When will a wire experience no force in the motor effect?

A

If the wire is parallel

20
Q

In what direction does the force always act in the motor effect?

A

At right angles from the magnetic field and the direction of the currnet

Physics (11 decks)

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