OnlineCBT
Physics · PYQ NEET UG 2026
हिन्दीConsider a fixed uniformly charged insulating sphere with radius R and total charge +Q. A point charge -q (q<
Correct answer · Option 1
\( \sqrt{\frac{3Qq}{4\pi\varepsilon_0 m R}} \)
Explanation
Using conservation of energy: \( \Delta K + \Delta U = 0 \). \( \frac{1}{2}mv^2 - 0 = \frac{Qq}{4\pi\varepsilon_0 R} - \frac{Qq}{4\pi\varepsilon_0 (3R)} \). Solving gives \( v = \sqrt{\frac{3Qq}{4\pi\varepsilon_0 m R}} \).
