Q. Two small spheres each having the charge $+ Q\ $are suspended by insulating threads of length $L$ from a hook. This arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will be
A) $180^{0},\frac{1}{4\pi\varepsilon_{0}}\frac{Q^{2}}{(2L)^{2}}$
B) $90^{0},\frac{1}{4\pi\varepsilon_{0}}\frac{Q^{2}}{L^{2}}$
C) $180^{0}.\frac{1}{4\pi\varepsilon_{0}}\ \frac{Q^{2}}{2L^{2}}$
D) $180^{o},\ \frac{1}{4\pi\varepsilon_{0}}\ \frac{Q^{2}}{L^{2}}$
Explanation
(a) The position of the balls in the satellite will become as shown below because it is gravitation free space
Thus angle $\theta = 180^{0}$ and force $= \frac{1}{4\pi\epsilon_{0}}.\frac{Q^{2}}{(2L)^{2}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.