A capacitor consists of two parallel circular plates of radius r. The capacitor has capacitance C and is being charged in a simple circuit loop. The circuit has an initial current I0 and consists of the capacitor, a battery with voltage V, and a resistor with resistance R What is the magnetic field in the middle of the capacitor plates at a distance d from the center, as a function of time t? Give your answer in terms of d, r, I0, t, R, C,

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