Science and Mathematics for Engineering 6th Edition by John Bird

Exercise 5

An electron in a telev ision tube has a charge of $1.5 \times 10 ^ { - 19 } \mathrm { C }$ and trav els at $3 \times 10 ^ { 7 } \mathrm {~m} / \mathrm { s }$ perpendicular to a field of flux density $20 \mu \mathrm { T }$ . Calculate the force exerted on the electron in the field.