18 A stream of electrons travels in a straight line through a uniform magnetic field and between a pair of charged parallel plates, as shown in the diagram. 3.5 cm 500 V Calculate the: a magnitude of the electric field strength between the plates b speed of the electrons, given that the magnetic field is of strength 1.5 x 10 T.

18 A stream of electrons travels in a straight line through a uniform magnetic field and between a pair of charged parallel plates, as shown in the diagram. 3.5 cm 500 V Calculate the: a magnitude of the electric field strength between the plates b speed of the electrons, given that the magnetic field is of strength 1.5 x 10 T.