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OAT- Physics > Electricity and Magnetism > Flashcards

Electricity and Magnetism Flashcards

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1
Q

A particle must always have a

A

“q” a charge

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2
Q

In which direction does the electric field always move

A

The electric field will always move in the direction of a positive test charge’s force it would feel

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3
Q

Formula for force of an electric feild

A

F = qE

Used in any sitation where you have an electric field

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4
Q

Units for the electric force

A

Columns (C)

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5
Q

Coulomb’s Law

Formula for attraction between 2 charges only

A

F = k(q1q2/r^2)

Analogous to the Fg formula

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6
Q

Charge of an electron

A

1.6 x 10^-19C

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7
Q

Formula for electric field due to a point charge

A

E = k(q/r^2)

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8
Q

Formula for Potential Voltage

A

V = k(q/r)

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9
Q

Formula for potential energy

A

P.E. = qV

Can also be referred to as “U”

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10
Q

Objects will move how in terms of potential energy

A

Objects move from high potential energy to low potential energy

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11
Q

Keep in mind that with negative charges they move towards higher voltages because

A

They are becoming more negative and there for moving towards lower potential energy

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12
Q

When using Coulomb’s law if charges are the same

A

We only calculate one electric field, other wise we’d calculate two different ones

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13
Q

Formula for Ohm’s law

A

V = IR

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14
Q

Formula for current

A

I = q/t

Units are Amphs

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15
Q

A current flows like

A

The imaginary flow of positive charges

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16
Q

How does the current behave for elements or resistors in a series

A

They have the same current

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17
Q

How does the current behave for elements or resistors in parallel

A

They have the same potential “drop”

18
Q

Formula for resistance

A

R = ρ(L/A)

19
Q

Formula for resistors in series

A

Req = R1+R2+R3+…

20
Q

Formula for resistors in Parallel

A

(1/Req) = 1/R1 + 1/R2+…

21
Q

Formula for Power

A

P = VI = I^2R = V^2/R

V being the Voltage drop across resistors not the total voltage

22
Q

Kurkoff’s Junction Rule

A

Any current flowing in must also flow out

23
Q

Kurkoff’s Loop Rule

A

In any loop around a circuit; any potential increase will be balanced by a potential decrease

24
Q

Shortcut when you only have 2 resistors

A

R1 x R2/ R1+R2

25
Q

Formula for rms voltage

A

Vrms = Vmax/√2

26
Q

Formula for rms intensity

A

Irms = Imax/ √2

27
Q

Formula for capacitance

A

C = Q/V

Units are Farad’s

28
Q

Paralel Plate Capacitor Formula

A

C = kε0(A/d)

k= dielectric constant

29
Q

Formula for potential energy stored in a capacitor

A

P.E. = 1/2 CV^2

30
Q

Formula for capacitors in a series

A

1/Ceq = 1/C1 + 1/C2 +…

31
Q

Formula for capacitors in parallel

A

Ceq = C1 + C2 + …

32
Q

What happens to the charge, the voltage and the intensity when charging

A

Q & V start from rest and slowly rise up to a max amount.

Intensity starts at max and decreases

33
Q

What happens to charge, voltage and intensity when discharging

A

Q & V & I start from max and decrease

34
Q

Formula for a charged particle moving through a magnetic field

A

F = qvBsinθ

V = velocity
B = Magnetic field 
θ = angle between v & B
35
Q

Right hand rule for a charged particle moving through a magnetic field

A 
Thumb = v
Fingers = B
Palm = Force
36
Q

For negative charges the force comes out of

A

The back of your right hand’s palm

37
Q

Formula for current-carrying wire in a magnetic field

A

F = ILBsinθ

38
Q

Right hand rule for current carrying wire in a magnetic field

A 
Thumb = I
Fingers = B 
Palm = Force
39
Q

Magnetic field due to a current carrying wire formula

A

B = μoI/2πr

40
Q

Right hand rule magnetic field due to a current carrying wire

A

Thumb = I

Fingers (curled) = B

OAT- Physics (6 decks)

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