8. Electron travelling though two horizontal plates In the diagram P1 and P2 are two parallel horizontal plates that are 12.7 mm apart in a vacuum and have a potential
difference of 169 volts maintained between them, the upper plate being positive. Also, there is a horizontal magnetic field
of 0.033 T as shown.
X
De
x
x
X
P,
X
electron
beam X
P2 * * * * *
x x
X
x x
4111
x
X
X
x
x
A horizontal beam of electrons is directed between the plates so that it is moving at right angles to the magnetic field as
shown.
The magnitude of the electric field between the plates, to two significant figures, is: