MCQ
A uniformly charged thin spherical shell of radius $\mathrm{R}$ carries uniform surface charge density of $\sigma$ per unit area. It is made of two hemispherical shells, held together by pressing them with force $\mathrm{F}$ (see figure). $\mathrm{F}$ is proportional to
- ✓$\frac{1}{\varepsilon_0} \sigma^2 R^2$
- B$\frac{1}{\varepsilon_0} \sigma^2 R$
- C$\frac{1}{\varepsilon_0} \frac{\sigma^2}{\mathrm{R}}$
- D$\frac{1}{\varepsilon_0} \frac{\sigma^2}{\mathrm{R}^2}$
