Question

linear dimensions of parallel plate capacitor of length l*l and distance between them is d much smaller than l.half of the space between them is filled with mica sheet of thickness d/2 and dielectric constant E1.the plates are connected across an ideal battery of resistance r.the mica sheet is pulled slowly out of the capacitor with constant velocity v.find the heat developed in the capacitor.permittivutyof free space is e0
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Answer 1

Answer:

Parallel

Capacitance of the capacitor shown above is

C  

e

​  

q=(1+k)  

2

C  

0

​  

 

​  

       

correct

Electric field in the dielectric-filled region is higher than that in the air-filled region - incorrect as V↓

Charge on the half of the top plate above the air filled;

Q  

1

​  

=  

2

C  

0

​  

Vk

​  

 

And, with air filled;

Q  

2

​  

=  

2

C  

0

​  

V

​  

      Potential is same

⇒  

k

Q

​  

   

 Charge on the half of the top plate above the air-filled part is - correct