A parallel-plate capacitor with circular plates of radius R is being discharged. The displacement current through a central circular area, parallel to the plates and with radius R/2, is 9.2 A. What is the discharging current?

The discharging current is

Explanation:

From the question we are told that  

     The radius of each circular plates is  R

     The displacement current is  

      The radius of the central circular area is  

The discharging current is mathematically represented as

where A is the area of each plate which is mathematically represented as

and   k is central circular area which is mathematically represented as

So  

substituting values

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