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A charged particle entering a magnetic f...

A charged particle entering a magnetic field from outside in a direction perpendicular to the field

A

can never complete one rotation inside the field

B

may or may not complete one rotation in the field dependent on its angle of entry into the field

C

will always complete exactly half of a rotatioin before leaving the field

D

may follow a helical path depending on its angle of entry into the field

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The correct Answer is:
A
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