Question

A solenoid has 450 loops, each of radius 0.0254m. the field increases from0 t to 3.00 T in 1.55 s. what is the EMF generated in the coil?
(Hint: what is the area of a circle?)
(Unit=volts)

Answer 1

Hi there! So do you know Faraday's law? That's what it looks like we'll need to use

How do you calculate the area of a circle?

Answer 2

@zaky21 are you still there?

Answer 3

yes

Answer 4

yes

Answer 5

So what's Faraday's law?


Also what's the formula for finding the area of a circle?

Answer 6

A=πr2

Answer 7

So what is the area if the radius is 0.0254 m

Answer 8

2.03×10-3

Answer 9

Good! Now the formula we need to be using is

EMF = -n * \(\frac{\Delta (BA)}{\Delta t}\)

Answer 10

We just found A, which is the area

We are given what B is. It goes from 0 to 3.00 T

So what is the change in the magnetic field?

It would be the final - initial
So what would that be?

Answer 11

i dont get it

Answer 12

So the formula has \(\Delta\)

That means the change in

Our magnetic field went from 0 to 3
0 is our initial, 3 is our final magnetic field

So the change in the magnetic field is final minus initial

What would that be? Just told you which number is initial and final as well

Answer 13

so wat do i subtract

Answer 14

0 is initial
3 is final

Do final - initial

Answer 15

Final minus initial

Answer 16

so 0-3

Answer 17

so 0-3

Answer 18

so 0-3

Answer 19

Is 0 the initial value or the final value?

Answer 20

initial?

Answer 21

Yes so are we doing final - initial

Or initial - final?

Answer 22

initial

Answer 23

That doesn't answer what I asked

Should it be
3-0=?

Or should we be doing
0-3=?

Answer 24

0-3

Answer 25

bro you're so hopeless

FINAL MINUS INITIAL

3 IS FINAL
0 IS INITIAL

SO DO FINAL MINUS INTIAL

WHAT DO YOU GET

Answer 26

its 3

Answer 27

@TheSmartOne

Answer 28

its 3 bro

Answer 29

Yes now plug it all in

Answer 30

EMF = -n * \(\frac{\Delta (BA)}{\Delta t}\)

n = 450
B = 3
A = 2.03*10^-3
t = 1.55

Answer 31

−1.76806451
thats wat i got

Answer 32

Yes

Answer 33

i have another one

Answer 34

New post then

Answer 35

i did