Deepak Patra
Last Activity: 10 Years ago
Sol. A = 20 cm2 = 20 * 10^–4 m2
d = 1 mm = 1 * 10–3 m ; R = 10 KΩ
C = E base 0A/d = 8.85 * 10^-12 * 20 * 10^-4/1 * 10^-3
= 8.85 * 10^-12 * 2 * 10^-3/10^-3 = 17.7 * 10^-2 Farad.
Time constant = CR = 17.7 * 10^–2 * 10 * 10^3
= 17.7 * 10^–8 = 0.177 * 10^–6 s = 0.18 μs.