8. From Sample Problem 32-1 we know that B ∝rfor r ≤Rand B ∝r–1for r ≥R. So the maximum value of Boccurs at r = R, and there are two possible values of rat which the magnetic field is 75% of Bmax. We denote these two values as r1and r2, where r1< Rand r2> R. (a) Inside the capacitor, 0.75 Bmax/Bmax= r1/R, or r1= 0.75
This is the end of the preview. Sign up
access the rest of the document.