An electron is moving along the positive x-axis. If the uniform magnetic field is applied parallel to the negative z-axis, then
A. The electron will experience magnetic force positive y-axis
B. The electron will experience magnetic force negative y-axis
C. The electron will not experience any force in magnetic field
D. The electron will not continue to move along the positive x-axis
E. The electron will move along circular path in magnetic field
Choose the correct answer form the options given below:

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B and E only

B and D only

C and D only

A and E only

answer is D.

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Detailed Solution

$v = v_{0} \hat{i}, B = B_{0} (- \hat{k})$

$F = q (\bar{v} \times \bar{B}) = - e (v_{0} \hat{i} \times B (- \hat{k})) = {ev}_{0} B_{0} (- \hat{j})$

As the velocity is perpendicular to the direction of velocity the electron will move in a circular path.

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