An electron enters a chamber in which an uniform magnetic field is present as shown in figure. Ignore gravity. During its motion inside the chamber
KVPY 2013, Medium
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(b)
Magnetic force $F$ acting on the electron is perpendicular to $v$ and $B$.
$F =q \cdot( v \times B )$
As $F$ is perpendicular to $v$ so, $F \cdot v =0$.
Hence, work done by force is zero.
As force is not doing any work so magnitude of velocity or kinctic energy of electron remains constant.
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