Electrostatics 5 Question 3
3. A simple pendulum of length
(Main 2019, 10 April II)
(a)
(b)
(c)
(d)
Show Answer
Answer:
Correct Answer: 3. (a)
Solution:
- When pendulum is oscillating between capacitor plates, it is subjected to two forces;
(i) Weight downwards
(ii) Electrostatic force acting horizontally
So, net acceleration of pendulum bob is resultant of accelerations produced by these two perpendicular forces.
Net acceleration is,
So, time period of oscillations of pendulum is
