The potential difference between a pair of oppositely chargedparallel plates is

Question

The potential difference between a pair of oppositely chargedparallel plates is 438 V. (a) If the spacing between the plates isdoubled without altering the charge onthe plates, what is the new potential difference between theplates?
1 V
(b) If the plate spacing is tripledwhile the potential difference between the plates is kept constant,what is the ratio of the final charge on one of the plates to theoriginal charge?
2 (Qfinal /Qinitial) (a) If the spacing between the plates isdoubled without altering the charge onthe plates, what is the new potential difference between theplates?
1 V
(b) If the plate spacing is tripledwhile the potential difference between the plates is kept constant,what is the ratio of the final charge on one of the plates to theoriginal charge?
2 (Qfinal /Qinitial)

Explanation / Answer

doubling the distance between the plates capacitance=C/2 charge is kept constant hence CV remains the same potential difference doubles=876V if the spacing is tripled C=C/3 and V (q/C)is kept constant hence Qfinal /Qinitial=CFINAL/CINITIAL=1/3

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