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  4. If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then the

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Q. If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then the

Uttarkhand PMTUttarkhand PMT 2011

Solution:

In direction of velocity of an electron is in the direction of field, then
$\theta=0^{\circ}$
Force, $F=q v B \sin \theta$
$\left(\because \sin 0^{\circ}=0\right)$
$=0$ Force is zero.
So, velocity of an electron will remain same.