A pendulum with charge q is placed at the centre of the line joining two equal charges Q such that - Physics - Electric Charges And Fields

Question

A   p e n d u l u m   w i t h   c h a r g e   q
  i s   p l a c e d   a t   t h e   c e n
t r e   o f   t h e   l i n e   j o i n i n g
  t w o   e q u a l   c h a r g e s   Q  
s u c h   t h a t   t h e   s y s t e m s   o s
c i l l a t i o n s   a r e   h e a v i l y   d a m
p e d   I f   w e   c o n s i d e r   s u c h
  a   s y s t e m   t o   b e   i n  
e q u i l i b r i u m   t h e n   t h e   v a l u e
  o f   q   i s A Q / 8 B   - Q / 8 C   q
/ 4 D     - q / 4

Sandeep K. Gupta · Accepted Answer