Each plate of a parallel plate air capacitor has an area S. What amount of work has to be performed by external agent to slowly increase the distance between the plates from x 1 to x 2 if:
(i) the charge of the capacitor, which is equal to q is kept constant in the process.
(ii) the voltage across the capacitor, which is equal to V is kept constant in the process
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(i) 
(ii) (–) 
Sol. Work done = change in potential energy
(i) W = U f – U i = 
– 
= 
= 
s
(ii) W ex + W B = U f – U i = 
= 
W ex = (U f – U i ) – W B = 
– Δ CV 2 = – 
= (–) 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
The capacity of a parallel plate condenser is . When a glass plate is placed between the plates of…
A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then sli…
The energy of a charged capacitor is given by the expression ( = charge on the conductor and C = i…
The capacity of a condenser is farad and its potential is . The energy released on discharging it…
The insulated spheres of radii and having charges and respectively are connected to each other.…
In a charged capacitor, the energy resides