An electric field of 1500 ~V / m and a magnetic field of 0.40 ~Wb / m ² act on a moving electron. The minimum uniform speed along a straight line the electron could have is

Step-by-step solution

Given, electric field, E=1500 ~V / m Magnetic field, B=0.4 ~Wb / m ² Charge on electron, q=e=1.6 10⁻¹⁹ C For minimum uniform speed of electron along a straight line is a region, where electric field E and magnetic field B , both are present is given as v= E B [ array l q E=B q v v= E B array ]= 1500 0.4 =3750 ~m / s =3.75 10³ ~m / s