Two 12-cm-diameter electrodes 0.48cm apart form a parallel-plate capacitor. The

Question

Two 12-cm-diameter electrodes 0.48cm apart form a parallel-plate capacitor. The electrodes are attached by metal wires to the terminals of a 13Vbattery. After a long time, the capacitor is disconnected from the battery but is not discharged.

Part A

Express your answer to two significant figures and include the appropriate units.

Part B

Express your answer to two significant figures and include the appropriate units.

Part C

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

a) V wouldnt have changed so V = 13 V

C = e0 A/d

Q = C V = 13*8.85E-12*pi*0.06^2/0.48E-2= 2.71E-10 C

E = V/d = 13/0.48E-2= 2708 N/C

b) Q would be the same, Q = 2.71E-10 C

V = Q/C = 2.71E-10/(8.85E-12pi*0.06^2/1.2E-2)=32.49 V

E = V/d = 32.49/1.2E-2= 2708 N/C

c) Q would be the same 2.71E-10 C

V = 2.71E-10/(8.85E-12pi*0.95^2/0.48E-2)=0.0518 V

E = V/d = 0.0518/0.48E-2= 10.79

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