1.

Three charges \[4q,\,Q\] and \[q\] are in a straight line in the position of 0, \[l/2\] and \[l\] respectively. The resultant force on \[q\] will be zero, if \[Q=\] [CPMT 1980]

A. ? q
B.          \[-\,2q\]
C. \[-\frac{q}{2}\]   
D.          \[4q\]
Answer» B.          \[-\,2q\]


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