A parallel-plate capacitor having plates 6.8 cm apart is connected across the te

Question

A parallel-plate capacitor having plates 6.8 cm apart is connected across the terminals of a 12 V battery.

Part A Being as quantitative as you can, describe the location of the equipotential surface that is at a potential of 6.0 V relative to the potential of the negative plate. Avoid the edges of the plates.

ans: d = ___ cm away from the negative place

Part B Do the same for the equipotential surface that is at 3.0 V relative to the negative plate.

ans: d = ___ cm away from the negative place

Part C What is the potential gradient between the plates?

ans: E = ___ V/m

Explanation / Answer

(A) it will be in middle of plates.

d = 6.8/2 = 3.4 cm

(B) n = 12 / 3 = 4

d = 6.8/ 4 = 1.7 cm

(C) E = V / d

E = 12 V / (0.068 m)

E = 176.5 V/m

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