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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