An upward force acts on a proton as it moves with a speed of 2.0 * 105 meters/second through a magnetic field of 8.5 * 10-2 tesla running from east to west. What is the force and direction of the force on the proton?

2.7 * 10-15 N to the north

2.7 * 10-15 N to the south

1.7 * 10-14 N to the north

1.7 * 10-14 N to the south

1.7 * 10-14 N downward

We are given:

the speed of a proton = 2.0 * 10^5 meters/second;

moving through a magnetic field = 8.5 * 10-2 tesla

direction: east to west

The force and the direction of the force of the proton is determined using the magnetic field formula

F = qvxB

where q = charge

v = vector

x = speed

B = magnetic field

F = 1.6x10^-19 C * 2.0 * 10^5 m/s * 8.5 * 10-^2 tesla

solve for F and the direction of your force is opposite the direction of the proton which is north since the proton is going upwards.