(a) What is the velocity of a beam of electrons that go undeflected when passing through crossed...

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(a) What is the velocity of a beam of electrons that go undeflected when passing through crossed (perpendicular) electric and magnetic fields of magnitude 1.88 × 104 V/m and 2.60 × 10-3 T, respectively?
(b) What is the radius of the electron orbit if the electric field is turned off?
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