a) What is the speed of a beam of electrons that go undeflectedwhen passing through crossed electric and magnetic fields ofmagnitude 1.39x104 V/m and 2.92x10-3 T,respectively? Give your answer to 3 sf.
b) Protons move in a circle of radius 5.2 cm in a 0.502 Tmagnetic field. What value of electric field could make their pathsstraight? Give your answer to 3 sf.
c) The beam of electrons goes undeflected when passing throughcrossed electric and magnetic fields of magnitude1.37x104 V/m and 2.92x10-3 T, respectively.What is the radius of the electron orbit, in mm, if the electricfield is turned off? Give your answer to 2 sf.
