The equation of capacitor charging is: Q=Q0e−t/RC Current, I=dQdt=−(Q0/RC)e−t/RC For parallel plate capacitor, C=Akϵ0d and R=pdA So, CR=pkϵ0 Now, current density, J=|I|A=Q0ARCe−t/RC=Q0Apkϵ0e−t/(pkϵ0)
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