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### Evaluating a claim A British bicycle light compan…

06:10
Johns Hopkins University
Problem 40

# You need to make a generator for your bicycle light that will provide an alternating emf whose peak value is 4.2 $\mathrm{V}$ . The generator coil has 55 turns and rotates in a 0.040 -T magnitude$\vec{B}$ ficld. If the coil rotates at 400 revolutions per sccond, what must the area of the coil be to develop this emf? Describe any problems with this design (if there are any).

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