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State the Biot-Savart law which gives th...

State the Biot-Savart law which gives the magnetic field B at a distance r from a current element. Hence obtain an expression for the magnetic field `B_(Q)` due to a point charge Q moving with constant velocity v (assumed non-relativistic).
Point charge Q and Q' are constrained to move along the x-and y-axes, respectively, with the same uniform speed v. AT time t = 0 both charges are at the origin. At time t calculate the Lorentz force F on Q' due to the magnetic field of Q

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`(mu_(0)QQ')/(8sqrt2pi t^(2))`
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