Suppose an electron beam travels to the right at a speed of
4.8?10^6 ?/?. (a) If there is a uniform electric field pointing
upward of 8400 V/m, what value of magnetic field would make the
beam travel undeflected through that region?
b)What is the
direction of the magnetic field if it is perpendicular to the
electric field?
explain part b
berifly
thank
you!