Question about changing magnetic flux

AI Thread Summary
The discussion focuses on calculating the change in magnetic flux for a 200-loop coil as an external magnetic field decreases from 0.060 T to 0.020 T. The formula for magnetic flux, Φ = N * B * A * cos(φ), is highlighted, with cos(φ) equaling 1 due to the alignment of the field and area. The area must be converted from cm² to m² for accurate calculations. Participants suggest calculating the initial and final flux values and then finding their difference. The thread emphasizes the importance of correctly applying the formula and unit conversions to arrive at the correct answer.
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Homework Statement



A 200-loop 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?

Homework Equations



\Phim = A * B

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 don't know If I am missing something, any help or tips would be greatly appreciated.
 
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i believe it would just be the initial flux - the final flux...

the full equation you want is \Phi= N*B*A*cos(\phi)
(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 cm2 to m2 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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