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Physics Paper 1 > Electromagnetism > Flashcards

Electromagnetism Flashcards

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1
Q

What are magnetic fields also called?

A

B-fields

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2
Q

What is a magnetic field?

A

A region of space in which a magnetic material feels a force

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3
Q

What is the equation to work out the force of the movement in a magnetic field?

A

F=BIL

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4
Q

What is the equation to work out the force of the movement in a magnetic filed at an angle?

A

F=BILSin(theta)

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5
Q

What can F=BILSin(theta) be rearranged into?

A

F=BQVSin(theta)

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6
Q

What direction does conventional current flow?

A

From north to south

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7
Q

What is B in F=BIL?

A

The strength of a magnetic field at a point due to unit length and current

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8
Q

How do you increase the amount of E.M.F induced?

A
  1. More coils
  2. Increase B-field flux density
  3. Increase relative movement
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9
Q

What does faradays law state?

A

The rate of change of movement through a magnetic field means the the amount of E.M.F induced

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10
Q

How is E.M.F induced when lines of flux are cut?

A
  1. Conduction electrons are moved by magnetic material cutting lines of flux
  2. Induced current due to movement of electrons
  3. Induced current results in induced E.M.F
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11
Q

What is the model answer for a conductor motor?

A
  1. Current flows in the coil
  2. B-field is induced
  3. Left hand rule
  4. Right hand rule
  5. Opposing forces
  6. Commuter causes continues rotation
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12
Q

What is the model answer for a current carrying conductor?

A
  1. Current carrying conductor
  2. Placed perpendicularly to B-field
  3. Forces act on conductor
  4. forces mean motion occurs
  5. AC causing alternating field
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13
Q

What is electric potential?

A

The potential energy that each coulomb of positive charge would have if placed in an electric field

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14
Q

What does equipotential mean?

A

No work is done in moving a charge along perpendicular lines to the field lines

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15
Q

What factors affect the electric field strength?

A
  1. The amount of P.D

2. The distance between metal plates

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16
Q

What are the equations for electric field strength?

A

E=V/d and E=F/Q

17
Q

What is magnetic flux?

A

The amount of magnetic field passing perpendicular through a defined area

18
Q

What is the equation for the amount of magnetic flux?

A

Magnetic flux=BASin(theta)

19
Q

What units does magnetic flux have?

A

Webers

20
Q

What is the magnetic flux linkage?

A

The number of coils

21
Q

How do you work out the magnetic flux linkage?

A

NBA, N being the number of coils

22
Q

How do you work out the magnitude of the induced E.M.F?

A

E=(N x magnetic flux)/t

23
Q

What is the equation for induced E.M.F using length?

A

E=BLV

24
Q

What is an electric field?

A

A region of space in which a charged particle feels a force

25
Q

What is the electric field strength?

A

Force per unit charge, E=F/Q

26
Q

What is coulombs law?

A

The force between 2 charged particles is directly proportional to the product of charges and inversely proportional to the distance squared

27
Q

What is coulombs laws equation?

A

F=KQQ/r^2

28
Q

What is coulombs fields equations?

A

E=KQ/r^2

29
Q

What is a capacitor?

A

A set of parallel plates separated by an insulating material

30
Q

What does a capacitor do?

A

Stores charge

31
Q

What is the model answer for capacitance?

A
  1. Electrons flow from negative side of cell to the RH plate of capacitor
  2. RH plate becomes negatively charged
  3. At the same time electrons flow to LH plate and to positive cell terminal
  4. Flow of charge = current
  5. Current stops when P.D of capacitor = P.D of cell
32
Q

What is capacitance?

A

The measure of a capacitors ability to store charge

33
Q

What is the equation of capacitance?

A

c=Q/V

34
Q

What does the area under a QV graph equal?

A

Energy=1/2 x QV

35
Q

What is the equation for discharging a capacitor?

A

Q=Qe^-t/Rc

36
Q

What is the time constant?

A

The time taken to decay to 37% of its original value

Physics Paper 1 (5 decks)

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