A parallel-plate capacitor with circular plates of radius R = 16 mm and gap width d = 5.0 mm has a uniform electric field between the plates. Starting at time t = 0,the potential difference between the two plates is V = (100 V)e-t/τ, where the time constant τ = 12 ms. At radial distance r = 0.80R from the central axis, what is the magnetic field magnitude (a) as a function of time for t≥ 0 and (b) at time t = 3τ?
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