1.

Three charges +44, Q and q are placed in a straightline of length I at points at distance 0, 1/2 and !respectively. What should be the value of Qinorderto make the net force on q to be zero?(b) -2q(d) 4g(c) 2

Answer»

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

F1 = 1/4∏ε (4q)q/l2

F2 = 1/4∏ε (Q)q/(l/2)2

= 1/4∏ε (4Q)q/l2

F1 +F2 =0

1/4∏ε (4q)q/l2+ 1/4∏ε (4Q)q/l2=0

Q=-q



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