There is a current of 20 A in a resistor that is connected in series with a para

Question

There is a current of 20 A in a resistor that is connected in series with a parallel - plate capacitor. The plates of the capacitor have an area of 0.80 m2, and no dielectric exists between the plates. (a) What is the displacement current between the plates? (b) What is the rate of change of the electric field strength between the plates? (c) Find the value of the line integral o B.dl , where the integration path C is a 15 - cm - radius circle that lies in a plane that is parallel with the plates and is completely within the region between them

Explanation / Answer

a) Id = I = 20 A

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b) dE/dt = Id / epsilon A

= 20 / (8.85 * 10-12 * 0.80)

= 2.82 * 1012 V/m.s

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c) phic = mu pi r2 Id / A

= (4 pi * 10-7 * pi * 0.152 * 20 )/ 0.8

= 2.22 muT.m

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