Magnetic Fields Flashcards

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1
Q

What is a magnetic field?

A

A magnet field is a region in which a magnet pole will experience a non-contact force

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2
Q

I’m which direction do magnetic field line point?

A

From north to south

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3
Q

What is magnetic flux density?

A

Magnetic flux density is a measure of the strength of a magnetic field. It can be viewed as the number of magnetic field line that pass through a given area

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4
Q

What three factors determine the force exerted on a charge moving through a magnetic field?

A

1) the magnetic flux density
2) the charge of the particle
3) the velocity of the particle perpendicular to the field

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5
Q

State the equation used to calculate the force of certes in a charge moving through a magnetic field?

A

F=BqVsinx

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6
Q

What is the relationship between the direction of a charge’s motion and the direction of the magnetic force jt experiences?

A

The force is always perpendicular to the charges motion

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7
Q

Describe and explain the path taken by a charge in a magnetic field?

A

The charge will move in a circular path. This is because the magnetic force always acts perpendicular to the charge’s motion and so acts as a centripetal force

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8
Q

What is produced by a current-carrying wire?

A

A magnetic field is produced in a concentric circles around a wire when a current passes through it

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9
Q

What occurs when a current-carrying wire is placed in a magnetic field?

A

The wire will experience a force due the permanent magnetic field interacting with the wire’s magnetic field

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10
Q

What three factors affect the force experiences by a current-carrying wire placed in a magnetic field?

A

1) the magnetic flux density of the field
2) the current passing through the wire
3) the length of the wire

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11
Q

State the equation used to calculate the force experienced by a current-carrying wire placed in a magnetic field

A

F=BILsinx

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12
Q

What is Flemings left-hand rule used for?

A

To determine the direction of the force experienced by a current-carrying wire or living charge in a magnetic field

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13
Q

What does the thumb represent when using Flemings left hand rule?

A

The thumb represents the direction of the force

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14
Q

What for the first finger represent when using Flemings left-hand rule?

A

The direction of the field

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15
Q

What does the second finger represent when using Fleming’s left-hand rule for a moving charge?

A

The direction that a positive charge would move. This means that of it is a negative charge, you just point your second finger on the opposite direction to its motion

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16
Q

What does the finger represent when using Fleming’s left-hand rule for a current-carrying wire?

A

The direction of conventional current flow