A solid sphere and a hollow sphere of equal diameters are raised to the same potential, then
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Both have equal charge
The capacitance of an isolated conducting sphere is \( C = 4\pi\varepsilon_0 R \). Charge resides only on the outer surface, so a solid and a hollow sphere of the same outer radius have the same capacitance.
\( \displaystyle q = CV = 4\pi\varepsilon_0 R\,V \)
Equal diameters mean equal \( R \), and the potential \( V \) is also equal, so the charges are equal.