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Q.

A charge Q  is placed at the centre of the line joining two point charges +q  and +q  as shown in figure. If the system is at equilibrium, the ratio of charges Q  and q  is

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a

-14

b

4

c

14

d

-4

answer is D.

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Detailed Solution

For the system to be in equilibrium,

net force on q=0 or Qq4πε0x2+qq4πε0(2x)2=0

or  Q =-q4 or Qq=-14

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