Q 11-04-021NEETJEE MainEAMCET 2011 (Engineering)Easy
A $1$ N pendulum bob is held at an angle $\theta$ from the vertical by a $2$ N horizontal force $F$. The tension in the string supporting the pendulum bob (in newton) is
Answer: (C) $\sqrt{5}$
The tension balances the weight ($1$ N, vertical) and the horizontal force ($2$ N), which are perpendicular:
$$T = \sqrt{1^2 + 2^2} = \sqrt{5}\ \text{N}$$
Solution by Sreeraj P, M.Sc Physics