Question: Q. 18. Eight identical spherical drops, each carrying a charge are at a potential of each. All these drops combine together to form a single large drop. Calculate the potential of this large drop.
(Assume no wastage of any kind and take the capacitance of a sphere of radius as proportional to ).
U] [CBSE SQP 2014]
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Solution:
Ans. Let the radius of each drop be . The capacitance of each drop is , where is a constant.
Also volt
Charge on each drop
Total charge on all the eight drops
Let be the radius of the large drop. Then
Capacitance of the large drop
Potential of the large drop volt
[CBSE Marking Scheme 2014]