1.

A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium, if \[q\] is equal to             [IIT 1987; CBSE PMT 1995; Bihar MEE 1995; CPMT 1999; MP PET 1999; MP PMT 1999, 2000; RPET 1999;  KCET 2001; AIEEE 2002; AFMC 2002; Kerala PMT 2004; J & K CET 2004]

A.                                                      \[-\frac{Q}{2}\]                   
B.            \[-\frac{Q}{4}\]
C.                    \[+\frac{Q}{4}\]
D.                                      \[+\frac{Q}{2}\]
Answer» C.                    \[+\frac{Q}{4}\]


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