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Suppose that a parallel-plate capacitor has circular plates with radius R = 43 mm and a...

Suppose that a parallel-plate capacitor has circular plates with radius R = 43 mm and a plate separation of 4.3 mm. Suppose also that a sinusoidal potential difference with a maximum value of 120 V and a frequency of 72 Hz is applied across the plates; that is,

V = (120 V) sin[2π(72 Hz)t].

Find Bmax(R), the maximum value of the induced magnetic field that occurs at r = R.

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