Question

Is this question possible?

Answer 1

Here it is:

Answer 2

The magnetic field perpendicular to the plane of a single copper wire loop of diameter 20.0 cm decreases from 0.6 T to zero. The diameter of the wire is 1.3 mm. How much charge moves through the wire as a result of the changing field?

Answer 3

I know how I would be able to calculate the current, which is the charge per time, but they don't give a time interval...

Answer 4

Sorry I don't know. But I think you are right.

Answer 5

Nobody's helped you yet?

Answer 6

Nope

Answer 7

I think I'll just give my answer as the current over t

Answer 8

Yes, I think t is needed to calculate q

Answer 9

we need to know the time needed to magnetic field, in order to decrease from 0.6 Tesla to 0 Tesla

Answer 10

i think the question is asking how much charge passes any given point during the overall field change. rate of change irrelevant.

thus, note the following:

\[|E| = \frac{d \phi}{dt} = IR = \frac{dQ}{dt} R\]

\[dQ = \frac{d \phi}{R}\]

\[Q = \frac{∆ \phi}{R}\]

for resistance, R, you know its dimensions and that it is copper so:

\[R = \frac{\rho l}{A}\]

rho for Cu is 1.68 (10^-8) Ohm m

Answer 11

good job! @IrishBoy123

Answer 12

I have forgotten the so called law of Felici