Practice!

Sample Problem

An airplane, accumulates an excess positive charge of 2.0 x 10-5C . What is the magnetic force on the airplane when passing at 240 m/s through and perpendicular to the Earth’s magnetic field. (B = 5.9 x 10-5 T) .

Solution

FB = |q|vBsinθ

FB =  (2.0 x 10-5C) (240 m/s) (5.9 x 10-5T) sin 90°

FB = 2.8 x 10-7 N