Test 2, Ch. 26-29

Question 1

Capacitors in series

Answer 1

Q(Charge) is the same for every capacitor

1/Ceq=1/C1+1/C2… then take inverse to get Ceq

Question 2

Capacitors in parallel

Answer 2

delta V is the same

Ceq=C1+C2…

Question 3

What does conventional current(I) represent?

Answer 3

the flow of positive charge

Question 4

Resistors in series

Answer 4

Current is the same

Req=R1+R2…

Question 5

Resistors in parallel

Answer 5

Delta V is the same

1/Req=1/R1+1/R2… then take the inverse to get Req

Question 6

KCL: Current law(Junction rule)

Answer 6

what goes into a junction must come out

Question 7

KVL: Voltage law(Loop rule)

Answer 7

if you go around a complete loop, Vnet=0

Question 8

Amp meter

Answer 8

measure current
wired in series
near zero resistance

Question 9

Volt meter

Answer 9

measures potential difference
wire in parallel
near infinite resistance

Question 10

Sign of a battery with and against current

Answer 10

with: +V
against: -V

Question 11

Sign of resistance with and against current

Answer 11

with: -IR
against: +IR

Question 12

What does an electric current generate?

Answer 12

a magnetic field

Question 13

what does moving electric charge feel?

Answer 13

a force due to an external magnetic field

Question 14

Right hand rule for magnetic field

Answer 14

go out v and curl towards r

Question 15

Right hand rule for a magnetic field of a negative charge

Answer 15

reverse whatever you get

Question 16

Why is gauss’s law zero for a magnetic field?

Answer 16

you cannot have monopoles

Question 17

Right hand rule for a force on a single charge

Answer 17

go out V and curl towards B

Question 18

Why does work equal zero for a single charge in a magnetic field?

Answer 18

the charge travels in a circle
F is always perpendicular to d
W=Fdcos(theta) and cos 90 is zero

Question 19

What is the purpose of the hall experiment?

Answer 19

to distinguish between positive and negative charges

Question 20

Paramagnetic

Answer 20

temporary magnet due to an external magnetic field that is attractive

Question 21

Diamagnetic

Answer 21

temporary magnet due to an external magnetic field that is repulsive

Question 22

Ferromagnetic

Answer 22

permanent magnet that remains after the external magnetic field is removed

Question 23

RC circuit discharging at t=0

Answer 23

Current=max

Charge =max

Question 24

RC circut discharging at t = infinity

Answer 24

Current=0

charge=0

Question 25

RC circuit charging at T=0

Answer 25

charge =0

Current =max

Question 26

RC circuit charging at t= infinity

Answer 26

Current= 0
Charge= max

Question 27

Electric potential energy(U)

Answer 27

1/2(C*V^2)

Question 28

What does a dielectric do in a capacitor?

Answer 28

1. Keeps plates apart
2. E between the plates decreases
   V increases
3. Capacitance increases

Question 29

How to derive the velocity selector equation

Answer 29

F(E)=F(B)
qE=qvB
V=E/B