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Grade 12Electrostatics

In the figure, if net force on Q is zero then value of Q/q is:

Question image for In the figure, if net force on Q is zero then val
Profile image of Deepak Kumar
7 Years agoGrade 12
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2 Answers

Profile image of Arun
7 Years ago
 
force on Q due to both q  F1= 21/2(KQq)/r2
force on Q due to another Q F2 = 2(KQq)/r2
Net force on Q
F = F1 +F2 = 21/2(KQq)/r2 + 2(KQq)/r2
Since F is zero. So
0 = 21/2(KQq)/r2 + KQQ/(2r2)
0 = 21/2q + Q/2
then Q/q = 2(21/2).
 
Hence option B is correct
Profile image of Khimraj
7 Years ago
 
force on Q due to both q  F1= 21/2(KQq)/r2
force on Q due to another Q F2 = 2(KQq)/r2
Net force on Q
F = F1 +F2 = 21/2(KQq)/r2 + 2(KQq)/r2
Since F is zero. So
0 = 21/2(KQq)/r2 + KQQ/(2r2)
0 = 21/2q + Q/2
then Q/q = 2(21/2).
Hope it clears.

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