TP 20.44

Given: r = 0.0560 m

d = 0.250 mm = 0.250 x 10^-3 m

Q = 1.20 mC = 1.20 x 10^-6 C

DV = 750 V

Find: k -?

C = Q/DV

C = k e_o A / d = k e_o (p r²) / d

Q/DV = k e_o (p r²) / d

k = Q d / (DVe_o (p r²))

k = (1.20 x 10^-6 C) (0.250 x 10^-3 m ) / ((750V)(8.85 x 10^-12 C²/(N-m²))(p ( 0.0560 m)²)) = 4.59