K.C.S.E Physics Q & A - MODEL 1998PP2QN06

K.C.S.E Physics Q & A - MODEL 1998PP2QN06

 Fig 5 shows a circuit for charging and discharging a capacitor; e, through a variable resistor R, X Y and T are points on a two-way switch.

a) Explain how the charging and discharging processes are achieved.
b) Table 2 show the variation of the charge q with time t when a 500u F capacitor was discharged though a resistor.

Table 2
(i) Plot a graph of charge 0 (y axis ) against time.
(ii) Determine the current flowing in the circuit at t =30s. (Give your answer to 1 decimal place)

ANSWERS