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Charging of Capacitors

ideal capacit...

Question

ideal capacitor conduct ac current but not dc why ?

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Solution

Dear student
$C a p a c i t o r s w h e n c o n n e c t e d t o a d c s o u r c e a l l o w t h e e l e c t r i c c u r r e n t t o p a s s t h r o u g h i t t h a t i s d u e t o p o t e n t i a l d i f f e r e n c e a c r o s s i t s p l a t e s i t c o n t i n u e s t o i n c r e a s e i t s c h a r g e a n d w h e n t h e p o t e n t i a l d i f f e r e n c e r e s p o n s i b l e f o r d r i v i n g c h a r g i n g t h e c a p a c i t o r v a n i s h e s t h a t i s i t i s a l s o c h a r g e d t o a c q u i r e t h e p o t e n t i a l e q u a l t o t h e e m f o f t h e c e l l c h a r g i n g i t t h a n t h e c u r r e n t s t o p s . W h e n c o n n e c t e d t o a n a c s o u r c e i t d o e s n o t s t o p t h e c u r r e n t f l o w i n g a s t h e c e l l a n d h e n c e t h e n a t u r e o f c h a r g e a c q u i r e d b y t h e p l a t e o f t h e c a p a c i t o r k e e p o n c h a n g i n g f r o m p o s i t i v e a t o n e t i m e t o t h e n e g a t i v e a t o t h e r t i m e a n d h e n c e c h a r g e k e e p s o n o s c i l l a t i n g a n d d o e s n o t c o n t i n u e t o g r o w l i k e i n c a s e o f d c c h a r g i n g R e g a r d s$

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