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Introductory Physics Homework Help
Wire loop placed in B field which is decreasing uniformly
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[QUOTE="jj364, post: 4313527, member: 454598"] [h2]Homework Statement [/h2] A wire loop of area 2·0×10−4 m[SUP]2[/SUP] contains 40 turns, and has a total resistance of 40Ω. The plane of the loop is perpendicular to a uniform magnetic field of magnitude B[SUB]0[/SUB]. 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 B[SUB]0[/SUB]. [h2]Homework Equations[/h2] None given [h2]The Attempt at a Solution[/h2] 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 B[SUB]0[/SUB] 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. [/QUOTE]
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Introductory Physics Homework Help
Wire loop placed in B field which is decreasing uniformly
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