A parallel plate capacitor with circular plates of radius R is being charged as shown. At the instant shown, the displacement current in the region between the plates enclosed between R2 and R is given by
43i
14i
3i
34i
A
43i
B
3i
C
34i
D
14i
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Solution
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Displacement current is given by
I=ε0dϕedt
=ε0AdEdt(∵ϕ=A.E)
=Addt(qA′)
=AA′i(∵dqdt=i)
=π(R2)2πR2
=14i
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