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The Circular Motion

A β - parti...

Question

A $β -$ particle enters a magnetic field making an angle of $45^{o}$ with the field lines. The path of the particle is

A

circular

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B

elliptical

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C

spiral

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D

a straight line

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Solution

The correct option is B spiral
the $v_{x} = \frac{v}{\sqrt{2}}$ will be responsible for circular motion and $v_{y}$ will take it in $+ Y$ direction thus making it a spiral path

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