Due to electromagnetic induction, the emf will be induced in the rod. Induced emf is given by the formula end A becomes more positive because the direction of the induced emf is from A to B. This is because of the magnetic field exerts a same force equal to on each of the electrons, where C. According to Fleming’s left hand rule (If a conductor is placed in a magnetic field then the force acting on the conductor is in the perpendicular direction to the magnetic field and current direction) the, end A becomes positive and, end B becomes negatively charged.

Conclusion: A rod AB moves with a uniform velocity v in a uniform magnetic field then the end A becomes positively charged.