At what rate must the potential difference between the plates of a parallel plat

Question

At what rate must the potential difference between the plates of a parallel plate capacitor with a 2.5 microfarad capacitor capacitance be charged to produce a displacement current of 1.8 amperes. A light ray travels with an angle of incidence 25 degree from air medium 1 one of index of refraction 1 to a medium 2 of index of refraction 1.333. Then it travels to medium 3 of index of refraction 1.6 and medium 4 has index of refraction 1.2 and emerges into air. calculate the angle of refraction in medium 3.

Explanation / Answer

displacement current = e0 * capacitance * rate of change of potential

1.8 = 8.85418782 * 10^-12 * 2.5 * 10^-6 * rate of change of potential
  
rate of change of potential = 8.1317453 * 10^16 V/s

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