
#1
Apr2812, 03:39 PM

P: 1

1. The problem statement, all variables and given/known data
A 200loop coil of cross sectional area 8.5 cm2 lies in the plane of the page. An external magnetic field of 0.060 T is directed out of the plane of the page. The external field decreases to 0.020 T in 12 milliseconds. What is the magnitude of the change in the external magnetic flux enclosed by the coil? 2. Relevant equations [itex]\Phi[/itex]m = A * B 3. The attempt at a solution Ive tried solving for both values of magnetic flux at each time and finding their difference. However, I still seem to get it wrong. I dont know If I am missing something, any help or tips would be greatly appreciated. 



#2
Apr2812, 09:23 PM

P: 103

i believe it would just be the initial flux  the final flux...
the full equation you want is [itex]\Phi[/itex]= N*B*A*cos([itex]\phi[/itex]) (N = the number of turns of the coil) however the direction of the area and the magnetic field are the same so cos(phi) = 1 just convert 8.5 cm^{2} to m^{2} which is 8.5 * 10^{4} so.... N(.06T)(A)  N(.02T)(A), just plug in your numbers...i believe this is right anyway, someone should check my work 


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