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Suppose that a parallel-plate capacitor has circular plates with radius R = 40.0 mm and a plate separation of 4.0 mm. Suppose also that a sinusoidal potential difference with a maximum value of 340 V and a frequency of 120 Hz is applied across the plates; that is V=(340.0 V)sin((2.*?)*(120 Hz * t)). Find B(r = 20.0 mm). Find B(r = 80.0 mm). Find B(r = 120.0 mm).

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