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Suppose an electron beam travels to the right at a speed of 4.8?10^6 ?/?. (a) If...

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!

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