An electron experiences the greatest magnetic force when it is moving northward

Question

An electron experiences the greatest magnetic force when it is moving northward in a uniform magnetic field of strength B = 1.5 T. The force, FB is vertically downward and of magnitude 7.0x10-13N. The only force acting on the electron is the magnetic force.

a.) What is the direction of the magnetic field? Draw and label a vector in the figure above to indicate the direction of the magnetic field.

b.) What is the speed of the electron?

c.) Is the velocity of the electron constant? Explain your answer.

Explanation / Answer

a) the direction of the magnetic field will be to the left because

F = q(V X B)

b) F = qvB

7*10^-13 = 1.6*10^-19*v*1.5

v = 2.91 * 10^6 m/s

c) no, velocity will not be constant

because the electron will move in a circular path and hence the direction will change and hence it's velocity.

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