Q ) .   A   u n i f o r m l y   c h a r g e d   r i n g   ( Q )   i s   p l a c e d   i n   a   v e r t i c a l   p l a n e . A   t h r e a d   o f   l e n g t h   ( l )   c o n n e c t s   t h e   c h a r g e   p a r t i c l e   ' q '   o f   m a s s   ' m ' a n d   r i n g   s u c h   t h a t   c h a r g e   p a r t i c l e   i s   i n   e q u i l i b r i u m   a l o n g   i t s   a x i s . T h e n   l e n g t   o f   t h e   s t r i n g   i s   k = 1 4 π 0





A   k Q q R m g 1 3 B   k Q q R m g 2 3 C   2 k Q q R m g 1 3 D   k Q q R 2 m g 1 3

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