- #1
jj364
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Homework Statement
A wire loop of area 2·0×10−4 m2
contains 40 turns, and has a total resistance of
40Ω. The plane of the loop is perpendicular to a uniform magnetic field of magnitude
B0. The magnetic field is now turned off such that the flux through the loop drops
linearly to zero. A total charge 4·0 ×10−6 C passes around the loop. Determine B0.
Homework Equations
None given
The Attempt at a Solution
Ok so I think that
Emf=-N[itex]\frac{d\Phi}{dt}[/itex]
but it says that the field drops linearly so that just becomes
Emf=-NA[itex]\frac{\Delta B}{\Delta t}[/itex]
Also Emf=IR
So from this I equated the two but I will just end up with an expression for B0 dependent on t, and I'm not sure if this is what is wanted. I'm unsure about my use of Ohm's law here too. Thanks in advance, any help at all would be great.