AP EAMCET · PHYSICS · Electrostatics
125 identical charged small spheres coalesce to form a big charged sphere, If the electric potential on each small sphere is 60 mV then the electric potential on the bigger sphere formed is
- A 30 V
- B 15 V
- C 1.5 V
- D 3 V
Answer & Solution
Correct Answer
(C) 1.5 V
Step-by-step Solution
Detailed explanation
\(\frac{\mathrm{kq}}{\mathrm{r}}=60 \mathrm{mV}\) \(\mathrm{V}_{\mathrm{i}}=\mathrm{V}_{\mathrm{f}} \Rightarrow\left(\frac{4}{3} \pi \mathrm{r}^3\right) \times 125=\frac{4}{3} \pi \mathrm{R}^3 \Rightarrow \mathrm{R}=5 \mathrm{r}\) Also, \(Q=125 \mathrm{q}\)…
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