Electricity and Magnetism

Question 1

A particle must always have a

Answer 1

“q” a charge

Question 2

In which direction does the electric field always move

Answer 2

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

Question 3

Formula for force of an electric feild

Answer 3

F = qE

Used in any sitation where you have an electric field

Question 4

Units for the electric force

Answer 4

Columns (C)

Question 5

Coulomb’s Law

Formula for attraction between 2 charges only

Answer 5

F = k(q1q2/r^2)

Analogous to the Fg formula

Question 6

Charge of an electron

Answer 6

1.6 x 10^-19C

Question 7

Formula for electric field due to a point charge

Answer 7

E = k(q/r^2)

Question 8

Formula for Potential Voltage

Answer 8

V = k(q/r)

Question 9

Formula for potential energy

Answer 9

P.E. = qV

Can also be referred to as “U”

Question 10

Objects will move how in terms of potential energy

Answer 10

Objects move from high potential energy to low potential energy

Question 11

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

Answer 11

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

Question 12

When using Coulomb’s law if charges are the same

Answer 12

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

Question 13

Formula for Ohm’s law

Answer 13

V = IR

Question 14

Formula for current

Answer 14

I = q/t

Units are Amphs

Question 15

A current flows like

Answer 15

The imaginary flow of positive charges

Question 16

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

Answer 16

They have the same current

Question 17

How does the current behave for elements or resistors in parallel

Answer 17

They have the same potential “drop”

Question 18

Formula for resistance

Answer 18

R = ρ(L/A)

Question 19

Formula for resistors in series

Answer 19

Req = R1+R2+R3+…

Question 20

Formula for resistors in Parallel

Answer 20

(1/Req) = 1/R1 + 1/R2+…

Question 21

Formula for Power

Answer 21

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

V being the Voltage drop across resistors not the total voltage

Question 22

Kurkoff’s Junction Rule

Answer 22

Any current flowing in must also flow out

Question 23

Kurkoff’s Loop Rule

Answer 23

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

Question 24

Shortcut when you only have 2 resistors

Answer 24

R1 x R2/ R1+R2

Question 25

Formula for rms voltage

Answer 25

Vrms = Vmax/√2

Question 26

Formula for rms intensity

Answer 26

Irms = Imax/ √2

Question 27

Formula for capacitance

Answer 27

C = Q/V Units are Farad’s

Question 28

Paralel Plate Capacitor Formula

Answer 28

C = kε0(A/d) k= dielectric constant

Question 29

Formula for potential energy stored in a capacitor

Answer 29

P.E. = 1/2 CV^2

Question 30

Formula for capacitors in a series

Answer 30

1/Ceq = 1/C1 + 1/C2 +...

Question 31

Formula for capacitors in parallel

Answer 31

Ceq = C1 + C2 + ...

Question 32

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

Answer 32

Q & V start from rest and slowly rise up to a max amount. Intensity starts at max and decreases

Question 33

What happens to charge, voltage and intensity when discharging

Answer 33

Q & V & I start from max and decrease

Question 34

Formula for a charged particle moving through a magnetic field

Answer 34

F = qvBsinθ ``` V = velocity B = Magnetic field θ = angle between v & B ```

Question 35

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

Answer 35

``` Thumb = v Fingers = B Palm = Force ```

Question 36

For negative charges the force comes out of

Answer 36

The back of your right hand’s palm

Question 37

Formula for current-carrying wire in a magnetic field

Answer 37

F = ILBsinθ

Question 38

Right hand rule for current carrying wire in a magnetic field

Answer 38

``` Thumb = I Fingers = B Palm = Force ```

Question 39

Magnetic field due to a current carrying wire formula

Answer 39

B = μoI/2πr

Question 40

Right hand rule magnetic field due to a current carrying wire

Answer 40

Thumb = I | Fingers (curled) = B