Example

A proton is moving at a speed of 3 x 104 m/s towards the West through a magnetic field of strength 500 Gauss directed South. What is the strength and direction of the magnetic force on the proton at this instant?

qproton = +e = 1.6 x 10-19 Coul.

v = 3 x 104 m/s, West

B = 500 Gauss * 1 Tesla/10,000 Gauss

= .05 T, South

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