A parallel-plate capacitor has an area of 4.59 cm2, and the plates are separated by 1.28 mm with air between them. it stores a charge of 334 pc. what is the potential difference across the plates of the capacitor?

Question

Physics

Monica

1 May, 08:34

A parallel-plate capacitor has an area of 4.59 cm2, and the plates are separated by 1.28 mm with air between them. it stores a charge of 334 pc. what is the potential difference across the plates of the capacitor?

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Answers (1)

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Paityn Hutchinson · Answer 1

a)

Capacitance = k x ε° x area / separation

ε° = 8.854 10^-12 F / m

k = 2.4max

average k = 0.78 / 1.27 * 2.4 + (1.27 - 0.78) / 1.27 * 1 = 1.474 + 0.386 = 1.86

(61.4 % separation k = 2.4 - - - 38.6 % k = 1 air - - - average k = 0.614 * 2.34 + 0.386 * 1 = 1.86

area = 145 cm2 = 0.0145 m2

separation = 1.27 cm 0.0127 m

C = 1.86 * 8.854 10^-12 * 0.0145 / 0.0127 = 18.8 pF

b) Q = C * V - - - 18.8 * 83 = 1560.4 pC = 1.5604 nC

c) E = V / d = 83 / 0.0127 = 6535.4 V/m