A capacitor is a perfect insulator for(a) Alternating currents(b) Direct currents(c) Both ac and dc(d) None of these
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answer :- option (b) direct currents .
explanation :- Do you know about function of capacity ?
yes, it is a device to store charge.
in case of direct currents, current is allowed to pass through it. in initial period, current charges the the plate of capacitor and hence potential gradually build up and at one stage it becomes equal to emf of charging battery.
as you know, current can't flow through equal potential surfaces. so, current stops to flow through it thereafter. This is why we say that A capacitor is assumed to be insulator for direct currents.
[ note : perfect insulator is imaginary case . practically doesn't exist such type of cases. ]
explanation :- Do you know about function of capacity ?
yes, it is a device to store charge.
in case of direct currents, current is allowed to pass through it. in initial period, current charges the the plate of capacitor and hence potential gradually build up and at one stage it becomes equal to emf of charging battery.
as you know, current can't flow through equal potential surfaces. so, current stops to flow through it thereafter. This is why we say that A capacitor is assumed to be insulator for direct currents.
[ note : perfect insulator is imaginary case . practically doesn't exist such type of cases. ]
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Answer:
(b) Direct Current
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