physics magnetic field

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  • Created by: abbin003
  • Created on: 19-12-19 18:19
what is a magnetic field
a field surrounding a permanent magnet or a current carrying conductor in which magnetic objects experience a (magnetic) force
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which direction does an arrow on a magnetic field line point
it points from north to south
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what are the shape of the magnetic field lines on a current-carrying wire
concentric circles
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which rule can you use to find the direction of the field
the right hand grip rule
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in the right hand rule what does the thumb point towards
the direction of the conventional current
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what is the difference between the magnetic field pattern for inside a solenoid compared to outside a solenoid
inside a solenoid lines are parallel and equidistant causing uniform magnetic field but outisde it's like a bar magnet
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what rule do you use to determine the direction of the force experienced by a current carrying conductor placed perpendicular to a magnetic field
Fleming's left hand rule
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state the equation to find the force (for a current carrying conductor)
F= BILsinθ
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what is magnetic flux density and state its unit
it's the strength of the field and the units are Tesla(T)
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what is the equation for force of a moving charged particle in a magnetic field
F=BQv for an electron F=Bev (v is for velocity)
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for a charged particle moving right angles to a uniform magnetic field (i.e moving in a circular path) state the equation for the radius
r =mv/BQ
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what is the equation when electric force= magnetic force (for a moving charged particle)
v=E/B
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define magnetic flux
the product of the component of the magnetic flux density perpendicular to the area and the cross-sectional area
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state the equation for magnetic flux and what is its unit
Φ=BAcosθ it's unit is weber Wb
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what is the magnetic flux linkage
magnetic flux linkage= NΦ (N is number of turns)
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what equation do you use if they ask you for the maximum magnetic flux
the equation for magnetic flux linkage
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when you're trying to find magnetic flux how do you measure the angle θ
find the angle the magnetic field of flux density makes with the normal of the cross sectional area
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state Faraday's Law
The magnitude of the induced e.m.f is directly proportional to the rate of change of magnetic flux linkage
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state the equation linking e.m.f with the change in magnetic flux linkage
ε=-ΔNΦ/Δt
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state lenz's law
The direction of the induced e.m.f of current is always such as to oppose the change producing it
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Card 2

Front

which direction does an arrow on a magnetic field line point

Back

it points from north to south

Card 3

Front

what are the shape of the magnetic field lines on a current-carrying wire

Back

Preview of the front of card 3

Card 4

Front

which rule can you use to find the direction of the field

Back

Preview of the front of card 4

Card 5

Front

in the right hand rule what does the thumb point towards

Back

Preview of the front of card 5
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