Finding magnetic field at radial distances between and outside a parallel plate capacitor

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Suppose that a parallel-plate capacitor has circular plates with radius R = 75.0 mm and a plate separation of 5.6 mm. Suppose also that a sinusoidal potential difference with a maximum value of 140 V and a frequency of 60 Hz is applied across the plates; that is V=(140.0 V)sin((2.*?)*(60 Hz * t)). Find Bmax(R), the maximum value of the induced magnetic field that occurs at r = R. Find B(r = 37.5 mm). Find B(r = 150.0 mm) Find B(r = 225.0 mm).

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