ch32-p022 - 22. From Eq. 28-11, we have i = ( / R ) e the...

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i = 12.0 V 20.0 x 10 6 e t/ τ = 3.50 × 10 7 A . Since i = i d (see Eq. 32-15) and r = 0.0300 m, then (with plate radius R = 0.0500 m) we find 77 13 0 22 (4 10 T m/A)(3.50 10 A)(0.030 m) 8.40 10 T 2 2 (0.050 m) d ir B R µ ππ −− π× × == = × . 22. From Eq. 28-11, we have i = ( ε / R ) e t/ τ since we are ignoring the self-inductance of the capacitor. Eq. 32-16 gives
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