A charged particle enters a magnetic field $H$ with its initial velocity making an angle of $45^\circ $ with $H$. The path of the particle will be
A
A straight line
B
A circle
C
An ellipse
D
A helix
AIIMS 1999, Easy
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D
A helix
d (d) The component of velocity perpendicular to $H$ will make the motion circular while that parallel to $H$ will make it move along a straight line. The two together will make the motion helical.
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