ch32-p008 - 8. From Sample Problem 32-1 we know that B r...

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8. From Sample Problem 32-1 we know that B r for r R and B r –1 for r R . So the maximum value of B occurs at r = R , and there are two possible values of r at which the magnetic field is 75% of B max . We denote these two values as r 1 and r 2 , where r 1 < R and r 2 > R . (a) Inside the capacitor, 0.75 B max / B max = r 1 / R , or r 1 = 0.75
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