A 4.0-cm-diameter parallel-plate capacitor with a 1.0 mm spacing is charged to 1000 V. A switch closes

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A 4.0-cm-diameter parallel-plate capacitor with a 1.0 mm spacing is charged to 1000 V. A switch closes at t = 0 s, and the capacitor is discharged through a wire with 0.20 Ω resistance.

a. Find an expression for the magnetic field strength inside the capacitor at r = 1.0 cm as a function of time.

b. Draw a graph of B versus t.

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