Magnetism and Electromagnetism Flashcards

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1
Q

Definition of magnetism

A

Study of the behaviour of magnets

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2
Q

Properties of magnets

A

Like pole repel
Attract magnetic materials such as - iron, nickel, cobalt and their alloys
Poles where force is concentrated
Freely suspended magent rests in North-South direction

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3
Q

Electrical method for demagnetisation

A

A.C. supply connected to solenoid. Magnet is placed inside the solenoid then slowly withdrawn away in the east-west direction

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4
Q

Stroking method for demagnetisation

A
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5
Q

Induction method for demagnetisation

A
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6
Q

Magnetic Field

A

Moves from North to South
Field lines never overlap
Strong where lines are close together

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7
Q

Electromagnet

A

Temporary magent that only works when supplied with a current

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8
Q

Solenoid

A

A cylindrical coild made by winding several turns of copper wire

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9
Q

How to increase electromagnetic strength

A

Increase current
Increase turns of coil
Change shape of core to a horse shoe

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10
Q

Fleming’s left hand rule

A

Predict direction of the force
Left first finger - North South (direction of magnetic field)
Left thumb - direction of force/motion
Left middle finger - Direction of current

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11
Q

Factors affecting force

A

Current changes, force changes

Poles change, current changes

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