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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