for 22 I think the answer is D, but 23?? I don\'t even understand the meaning of

Question

for 22 I think the answer is D, but 23?? I don't even understand the meaning of the peoblem!!!

22. The plates of 2 prallel plate capacitor each have an ares of 040 mi and are sepurted by distace of 0.02 m. They are charged until the penential difference between the plosnes is 30x0 v The charged capacitor is then isolsted. Deiarmine the magnitude of the electrie fiell betwen the capacitor plates. A) 60V B) 120 V'nm C) 1.0×10s Vina Avea5.40 m - O.an B) 3.0 x 10 Vim 3. Deerminé DesermieThe value of the capacitance. A) 9.0x 1F B) 18 x 10F C) 36x 10 p E) 6.4 x I0"E

Explanation / Answer

22) magnitude of E is V/d = 3000/0.02 = 150 kV =1.5*10^5 V/m
so the correct answer is D) 1.5*10^5 V/m

23) Capacitance is C = eo*A/d = (8.85*10^-12*0.4)/(0.02) = 1.8 *10^-10 F

So the the correct option is B) 1.8*10^-10 F

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