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If current can flow through a capacitor supplied with dc to complete the circuit then how can we say that a capacitor can block dc??

If current can flow through a capacitor supplied with dc to complete the circuit then how can we say that a capacitor can block dc??


 

Grade:11

3 Answers

bkarthik iyer
20 Points
9 years ago

2011-09-25

 

b'coz xc=1/2∏fC

 

but for dc f=0

thus xc=∞

thus I=0

that is why it blocks current.

Ashwin Muralidharan IIT Madras
290 Points
9 years ago

Hi Deeksha,

 

Please note that a capacitor blocks DC only when it is fully charged.

 

So you apply a potential of V across a capaitor of cpacitance C. Then if it is charged to a value Q = CV, in that case it would block a direct current.

Even when it blocks a direct current, please note that it has a potential difference maintained across its ends, due to its charge, given by V = Q/C.

 

As long as this charge is there on the capacitor, it would block DC.

Note that current I = dq/dt = d/dt(CV). As long as a constant voltage is applied, d/dt(CV) = 0.

Hence we say that, it blocks the DC.

 

Hope that was helpful.

 

All the best,

Regards,

Ashwin (IIT Madras).

deeksha sharma
40 Points
9 years ago

But why is it that while finding out the expression for displacement current we assume that the circuit is completed when a capacitor is connected in series with a bulb

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