tem 4 Part A A c A capacitor has parallel plates of area 12 cm2 separated by 2.5

Question

tem 4 Part A A c A capacitor has parallel plates of area 12 cm2 separated by 2.5 mm. The space between the plates is filled with polystyrene (K-2.6, En Find the permittivity of polystyrene. Express your answer using two significant figures 2.0 × 107 V/m). Submit Part B Find the maximum permissible voltage across the capacitor to avoid dielectric breakdown Express your answer using two significant figures. Submit My Answers Give Up Part c When the voltage equals the value found in part B, find the surface charge density on each plate Express your answer using two significant figures.

Explanation / Answer

part A)

permitivity of polystyrene = k * epsilon_0

permitivity of polystyrene = 2.6 * 8.854 *10^-12

permitivity of polystyrene = 2.302 *10^-11 C^2/(N.m^2)

part B)

let the maximum voltage is V

V = E * distance

V = 2 *10^7 * 2.5 *10^-3 V

V = 5 *10^4 V

the maximum potential across the dielectric is 5 *10^4 V

part C)

charge density on each plate = epsilon * Electric field

charge density on each plate = 2.302 *10^-11 * 2 *10^7

charge density on each plate = 4.604 *10^-4 C/m^2

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