Three charges +4q, Q and q are placed in a straight line of length λ at points at distance 0, λ /2 and λ respectively from one end of line. What should be the value of Q in order to make the net force on q to be zero?
Text Solution
Verified by ExpertsThe correct answer is:
A
Charges are placed as shown on line AC.
For net force on q to be zero, Q must be of –ve sign. If F 1 is force on q due ot 4q & F 2 due to Q
Then, F 1 = F 2 (magnitude wise)
or 
= 
∴ 4q = 4Q
or Q = q (in magnitude)
∴ Q = –q (with sign)
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