Q.
An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be
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a
Straight line along the x-direction
b
A circle in the xz-plane
c
A circle in the yz-plane
d
A circle in the .zy-plane
answer is B.
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Detailed Solution
F→=−ev→ × B→ ⇒ F→=−evi^ × Bj^ =evB −k^That is, force on electron is acting towards negative z-axis. Hence, particle will move on a circle in xz-plane.
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