the time in seconds required to produce a P.D at 20v across a capacitor at 1000uF when it is charged at a steady rate of 200uC/sec?

100 secs.

potential difference=20v,capacity=1000uF=1/1000F,I=200uC/s=0.2/1000C/s

from capacitance Q=CV,

                 we get,Q=0.02C

from current definition, t=Q/i

                                  t=0.02*1000/0.2

                                  t=100sec

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