Your camping buddy has an idea for a light to go inside your tent. He happens to

Question

Your camping buddy has an idea for a light to go inside your tent. He happens to have a powerful (and heavyl) horseshoe magnet that he bought at a surplus store. This magnet creates B 0.20 T field between two pole tips 10 em apart. His idea is to build a hand cranked ganerator shown in Figure. He thinks ou can male enoughcurrent to fulty light a 11-1.0?1ghtub rated at 4.0W That's not supor bright, but it should be plonty of light for routine activities in tho ont Figure 1) Part A Find an expressin ror the induced current as a function of time if you turn the crank at requency Assume that the semicircle has a radius of r = 5.0 cm and it is at Is h ysst point al t = Express your answer in terms of some or all of the variables B, R, r, f, t, and the constant Submit Previous Angwers Request Answer Incorrect; One attempt remaining: Try Again ? Part B

Explanation / Answer

I = pi2 r2 B f sin (2 pi f t) / R

= (pi2 * 0.052 * 0.20 * f / 1.0) sin (2 pi f t)

I = (4.93 * 10-3 f) * sin (2 pi f t)

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