Here:
(a) potential diff = Q / C = 0.137 x 10-6 / 244 x10-12 = 561.48 volts
(b) C = εA /d
so
A = d C / ε = 0.000265 * 244 x 10-12 / 8.85 x10-12 = 0.007303m2
(c) E = V / d = 561.48 /0.000265 = 2118792.5 V/m
(d) σ = Q / A = 0.137 x10-6 / 0.007303 = 1.876 x 10-5 C/m2
A parallel-plate air capacitor with a capacitance of 244 pF has a charge of magnitude 0.137...
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