 # Three charges 4q,Q and q are in straight line in the position o,l/2 and l respectively the resultant force on q will be  zero  Badiuddin askIITians.ismu Expert
148 Points
13 years ago

Dear pallavi

two force are acting on q ,one due to 4q and second due to Q

F1 = 1/4∏ε (4q)q/l

F2 = 1/4∏ε (Q)q/(l/2)

= 1/4∏ε (4Q)q/l

F1 +F2 =0

1/4∏ε (4q)q/l2   +  1/4∏ε (4Q)q/l=0

Q=-q

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4 years ago
three point charges 4q q and 2q are placed in a straight line of length 10 cm at points distance 0.5 cm 10 cm respectively.if the net force on charge 2q is zero,then calculate the value of q
3 years ago
Dear pallavi
two force are acting on q ,one due to 4q and second due to Q
F1 = K(4q)q/1^2
F2 = K(Q)q/(1/2)^2
= K(4Q)q/1
F1 +F2 =0
K(4q)q/1^2 + K(4Q)q/1 =0
Q=-q
Thanks
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