Q1 Three identical charged small spheres each of mass m are suspended from a common point by insulated light string each of length l.The spheres are always on vertices of equilateral triangle of side length x<<<l .Calculate the rate dq/dt with which charge on each sphere increase if length of the sides of triangle increases according to law dx/dt = a/ x

Q2 Two mutually perpendicular long straight conductors carrying  uniformly distributed charges of linear charge densities _`1 and ₂ are positioned at distance a from each other.How does the interaction between the rods depend on a?

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