Two concentric shells kept in air have radii \( \mathrm{R} \) and r. They have similar charge an...
Two concentric shells kept in air have radii \( \mathrm{R} \) and r. They have similar charge and equal surface charge density \( \sigma \). The electrical potential at their common centre is : (1) \( \frac{\sigma(\mathrm{R}+\mathrm{r})}{\varepsilon_{0}} \) (2) \( \frac{\sigma(R-r)}{\varepsilon_{0}} \) (3) \( \frac{\sigma(R+r)}{2 \varepsilon_{0}} \) (4) \( \frac{\sigma(R+r)}{4 \varepsilon_{0}} \) 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live
