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[" 212.Two infinitely long parallel wire...

[" 212.Two infinitely long parallel wires having linear charge "],[" densities "lambda_(1)" and "lambda_(2)" respectively are placed at a distance of "],[R" metres.The force per unit length on either wire will be "],[[K=1/(4 pi varepsilon_(0))]:],[[" (a) "K(2 lambda_(1)lambda_(2))/(R^(2))," (b) "K(2 lambda_(1)lambda_(2))/(R)," (c) "K(lambda_(1)lambda_(2))/(R^(2))," (d) "K(lambda_(1)lambda_(2))/(R)]]

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