Question

A closely wound search coil has an area A of 4 cm^2 , 160 turns, and a
resistance of 50 ohm. It is connected to a ballistic galvanometer whose
resistance is 30 ohm. The small coil is placed in a uniform magnetic
field B. When the coil is quickly rotated from a position where A parallel to B
to one where A perpendicular B, the galvanometer indicates a charge of 4 X 10^-5
coulombs.What is the magnitude of the field?

Answer 1

faraday's low

Answer 2

(not fluent in english)
when flow changes volts appear
use formula for volts
use definition formula for curent
assosiete those two (time goes away)
you have a formula with gharge Q and magnitude of field....

Answer 3

then how do we deal with these two resistances?

Answer 4

ooh sorry i have forgot to metion that Ohm's low is used too..
do you see it....?

Answer 5

yes, I have solve this problem, you really saved my life, thank you !

Answer 6

let's comaire results....

Answer 7

I get 0.05T

Answer 8

that is my number too!!

Answer 9

may I ask you another question about mutual inductance of two coils?

Answer 10

shoot

Answer 11

A solenoid of length 10 centimeters and radius 2 centimeters is wound
uniformly with 1000 turns. A second coil of 50 turns is would around the
solenoid near its center. What is the mutual inductance of the two coils?

Answer 12

final formula or way to get there??

Answer 13

I want to know which formula should I use and how to approach this problem, because I have the answer which is 0.79mH but I don't know how to get it. thanks