KCET2007PhysicsElectrostatics
The potential of a large liquid drop when eight liquid drops are combined is 20 ~V . Then the potential of each single drop was
Options
- A10 ~V
- B7.5 ~V
- C5 ~V
- D2.5 ~V
Correct answer
C. 5 ~V
Step-by-step solution
Volume of 8 drops = volume of big drop 8 q=Q Potential of one small drop (V^ )= q 4 ₀ r Similarly, potential of big drop (V)= Q 4 ₀ R Now, V^ V = q Q + R r array ll V^ 20 & = q 8 q 2 r r [from Eqs. (i) and (ii)] V^ & =5 volt array