Question

C???

Answer 1

@Vocaloid

Answer 2

a voltmeter is connected in parallel with a resistor (just have to memorize this), and a voltmeter measures potential

Answer 3

A

Answer 4

good

Answer 5

D

Answer 6

good

Answer 7

B

Answer 8

same current = must be in series = which two resistors?

Answer 9

B?

Answer 10

A and B are in parallel, which two resistors are "in line" on the same segment of wire?

Answer 11

IM stuck in betweeen choice A and D

Answer 12

if you re-draw resistor C and D they're on the same segment of wire, resistor B is in parallel with C and D

so option A

Answer 13

any thoughts? if the field lines are coming out one end and going in another there are probably two poles leading us to which choice?

Answer 14

well to be more specific, two opposite poles which eliminates A and D

between an iron bar and a magnet, a magnet is more likely to have a positive and negative end (an iron bar can kinda do this but it has to be magnetized first)

so B is your best possibility

Answer 15

C

Answer 16

good

Answer 17

B

Answer 18

I'm not really sure

I know the current points down via the RHR but idk if that also applies to the magnetic field

Answer 19

ok i just double checked the RHR and yeah that's right

Answer 20

D

Answer 21

remember that things in series have the same current

Answer 22

C

Answer 23

open circuit is an incomplete circuit so D not C

Answer 24

A

Answer 25

remember that a combination circuit = series + parallel circuit combined

for reversing direction it would be an AC current (B)

Answer 26

A

Answer 27

good

Answer 28

C

Answer 29

V = IR, you're given current and resistant so you just need to multiply 0.42 * 15

Answer 30

oh i thought i would divide

Answer 31

distance would be inverse right?

Answer 32

yes

Answer 33

A

Answer 34

well done

Answer 35

any thoughts? remember that resistor *resists* a current

Answer 36

another way to say "resists" is "opposes" so C is the best choice

Answer 37

you're given C = Q/V so you just need to divide the charge by the voltage

Answer 38

A

Answer 39

good

Answer 40

Not sure about this one

Answer 41

electromagnet --> electric magnet

current carrying wire has electricity

making A the best possibility

Answer 42

Not sure about this either :/

Answer 43

transformer, just have to memorize this unfortunately ;;

Answer 44

B

Answer 45

hm

what did you get when you did the right hand rule for the direction?

Answer 46

i did 0.72= 3.8*10^7 / 1.6 * 10^-19

Answer 47

0.72 is not F. 0.72 is the magnetic field B

Answer 48

oh shoot that's where I screws it up

Answer 49

F = qvB = (1.6*10^-19)(3.8*10^7)(0.72)

then use the RHR to find the direction

Answer 50

be careful with your parentheses/exponents

Answer 51

(1.6)(10^(-19))(3.8*10^7)(0.72) maybe that'll work better

Answer 52

good now find the direction

Answer 53

D

Answer 54

Actually no C

Answer 55

D

Answer 56

Ugh

Answer 57

yeah D

Answer 58

C

Answer 59

good

Answer 60

D

Answer 61

the right end is the north end (field lines un from north to south)

so the orientation of the 2nd bar is south on the left (B)

Answer 62

A

Answer 63

good

Answer 64

D

Answer 65

make sure you're dividing by r^2 not just r

also keep in mind the negative signs on the charges cancel each other out

Answer 66

B

Answer 67

Nipe its c

Answer 68

good , C is correct

Answer 69

sorry

Answer 70

A

Answer 71

keep in mind P = IV which is current times voltage

Answer 72

ugh b

Answer 73

good

Answer 74

D

Answer 75

well done

Answer 76

B

Answer 77

check your calculations

1/(total resistance) = 1/R + 1/R + 1/R

solve for total resistance

Answer 78

tr would be 0.6 /

Answer 79

1/T = 1/20 + 1/20 + 1/20

solve for T

Answer 80

C

Answer 81

1/20 + 1/20 + 1/20 = 3/20

1/T = 3/20

T = ?

Answer 82

D

Answer 83

good

Answer 84

C

Answer 85

copper is a conductor not an insulator, so the opposite

Answer 86

conductor --> lets charges move freely --> low resistance

Answer 87

also can we close this question, it's getting a bit long (100+ replies)

Answer 88

A

Answer 89

good