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JEE Main 2022 · 25 Jun · Shift 2, Physics question 57

27 identical drops are charged at 22 V each. They combine to form a bigger drop. The potential of the bigger drop will be ______ V.

Answer and worked solution

Official answer: 198

Big drop. Radius 3r3r (volume ×27) and charge 27q27q, so V=k(27q)3r=9V0=9×22=198V=\dfrac{k(27q)}{3r}=9V_0=9\times22=198 V.

Answer: 198

Topics:Electric potential
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