Magnetic Fields Flashcards

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1
Q

State Faraday’s law of electromagnetic induction

A

induced e.m.f. is proportional to the rate of change of magnetic flux

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2
Q

State Lenz’s law

A

the induced current or e.m.f. is in a direction so as to produce effects which oppose the change producing it

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3
Q

How is a magnetic flux density defined?magnetic flux density

A

The field strength that would cause a wire carrying a current of 1A perpendicular to the field to experience a force of 1N per m of length. B=F/(IL)

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4
Q

magnetic flux

A

magnetic flux density x area (perpendicular to field direction)

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5
Q

magnetic flux linkage

A

magnetic flux x the number of turns

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6
Q

tesla

A

SI unit for magnetic flux density; equivalent to 1 newton per ampere per metre

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7
Q

Weber

A

SI unit for magnetic flux

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8
Q

What does the spacing of magnetic field lines show?

A

Magnetic field strength/flux density.

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9
Q

How do you find the direction of the field lines around a current?

A

Using the right hand grip rule.

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10
Q

How is a field line or current running into the paper shown?

A

cross in a circle

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11
Q

How is a field line or current running out of the paper shown?

A

. in a circle

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12
Q

What is represented by the thumb in Fleming’s Left Hand rule.

A

(Direction of) force

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13
Q

What is represented by the first finger in Fleming’s Left Hand rule.

A

(Direction of the) magnetic field

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14
Q

What is represented by the second finger in Fleming’s Left Hand rule.

A

(Direction of) current

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15
Q

When is the equation r = mv/BQ used?

A

To find the radius of the path of a particle moving in a uniform magnetic field.

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16
Q

Why does a charged particle describe circular motion in a uniform magnetic field?

A

(There is a constant) force always acting at right angles to motion.

17
Q

Why do only particles with the correct velocity travel in a straight line in a velocity sleector?

A

The electric force balance the magnetic force (at this velocity).