In the arrangement shown in figure, the two point charges are in equilibrium. The infinite wire is fixed in the horizontal plane, and the two point charges are placed one above and the other below the wire.Considering the gravitational effect of the earth, the nature of q1 and q2 can be
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a
q1→ positive, q2→ positive
b
q1→ positive, q2→ negative
c
q1→ negative, q2→ negative
d
q1→ negative, q2→ positive
answer is B.
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Detailed Solution
Just draw the free-body diagram of both charge particles and see whether force can be zero or not on the particle. At least, one force should be opposite to others.