# 5.1.2 MAGNETIC FIELDS

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Describe magnetic field lines
always north to south
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Describe magnetic field lines in long straight current carrying conductors
RIGHT HAND GRIP RULE/ thumb is the direction of current/ concentric circles of increasing radii
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What is a solenoid?
many flat coils placed side by side
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What is magnetic flux density?
magnetic field strength/ measure of the strength of a magnetic field at a given point
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What is magnetic flux density measured in? define it
TESLA/ When a wire carrying 1A of current experiences a force of 1N per metre of length
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Describe Flemings left hand rule
force in a current conductor cutting a magnetic field at 90/ motor effect/ ThuMb motion of force/ First Finger - field/ seCond finger - current
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When do you use BIL?
BIL - for a current carrying length of wire/ if cut at an angle use cos
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When do you use BEV?
force on a charged particle moving through a uniform magnetic field/ can use circular motion = mv/r
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Describe the circular orbits of charged particles
mass m carrying charge c with velocity v/ does not affect speed/ needs to be moving
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Outline how mass spectrometers work
vaporised and ionised sample/ electric field accelerates the ions/ magnetic field deflects in circular path/ radius depends on mass to charge ratio, velocity/ only ions moving in a particular radius will make it through slits in detector
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what does a mass spectrometer do?
separates ions of different masses using a magnetic field
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## Other cards in this set

### Card 2

#### Front

Describe magnetic field lines in long straight current carrying conductors

#### Back

RIGHT HAND GRIP RULE/ thumb is the direction of current/ concentric circles of increasing radii

### Card 3

#### Front

What is a solenoid?

### Card 4

#### Front

What is magnetic flux density?

### Card 5

#### Front

What is magnetic flux density measured in? define it