# principle of a capacitor is that when a charged plate is brougt near uncharged earth connecyed plate the chaged plate induces an equal &oppposite charge on  the uncharged plate which will decrease the potential of the plate &hence increases its potential.my question is if i consider a point exactly at the centre the potential at the centre due equal  oppositely charged plates must be zero at the centre(becoz equal &opposite charges are induced) if this happens then the capacitance will infinity according to the equation which is incorrect to speak.please help.....please send answer on disha.karntaki@gmail.comor on facebook

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## 2 Answers

Aman Bansal
592 Points
12 years ago

Dear Disha,

The reason of charging and discharging stated by you is abso;utely correct but since the electric field lined at the edes of the plates are not exactly straight thats why center at the centre is not exactly zero.

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manu lahariya
17 Points
12 years ago

the potential at the center due to the to plates may be zero. or may not be.

but the eqation is C=Q/V . the thing that you interperted fron this was wrong.

here V is the potential diffrence between the to plates having opposite Q and -Q charge.

so i gusse its clear that there is no charge at the center .. and that is the fundamental defination of capicitance. V is not the absolute potential . it is potentail diffrence between the plates.

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