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A current of 0.50A is charging a circular plate capacitor with a radius of 8.6cm. If...

A current of 0.50A is charging a circular plate capacitor with a radius of 8.6cm. If the separation of the plates is 1.3mm, (a) what is the time ratio of the increase in the electric field between the plates (dE / dt)? (b) What is the magnitude of the magnetic field between the plates 4.5cm from the center?
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