22.5 Exercise 15

If you need additional support for these problems, see More Applications of Magnetism.

An electron in a TV CRT moves with a speed of $6 . \text{00} \times \text{10}^{7} \text{m}/\text{s}$, in a direction perpendicular to the Earth’s field, which has a strength of $5 . \text{00} \times \text{10}^{- 5} T$. (a) What strength electric field must be applied perpendicular to the Earth’s field to make the electron moves in a straight line? (b) If this is done between plates separated by 1.00 cm, what is the voltage applied? (Note that TVs are usually surrounded by a ferromagnetic material to shield against external magnetic fields and avoid the need for such a correction.)