The circuit below was at position a for a long time it is su

The circuit below was at position a for a long time. it is suddenly to position b at time t=0. (for each statement select T true, F false). the current through the resistor equals the current through the capacitor at all times. in the instant after the switch is thrown the voltage across the resistor is zero. in the instant after the switch is thrown the current through the capacitor is zero. in the instant after the switch is thrown the voltage across the capacitor is zero.

Solution

Charge in CR circuit at time t is q = Q [1-e ^-t/RC]

(Or) q/C = (Q/C) [1-e ^-t/RC]

          V = V_b[1-e ^-t/RC]      Where V b = 1 volt and time t = 0.9 ms = 0.9 x10 ^-3 s

             = (1 volt)[1-e ^{-(0.9x10^-3) /(250x 4 x10^-6)}]

            = 1- e ^-0.9

            = 1- 0.4065

            = 0.5934 volt