Question

3. Calculate

a. The force on an electron which is stationary in

I. A magnetic field of flux density 2.5T

ii. An electric field of intensity 1000V/m

b. The force on an electron moving with a velocity of 1.5×10^6m/s at right angles to

I. A magnetic field of flux density 1.5T

ii. An electric field of intensity 2000V/m

Answer 1

a. I. The force is zero because the electron is stationary.

a. II. The force is

$$F=Eq=1.6·10^{-16}\text{ N}.$$

b. I. The force is

$$F=qvB=3.6·10^{-13}\text{ N}.$$

b. II. The force is

$$F=Eq=3.2·10^{-16}\text{ N}.$$