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B
r=qBmv
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C
r=mqvB
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D
r=mBqv
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Solution
The correct option is Ar=mvqB When a charged particle of charge q and mass m is projected with velocity v in a uniform magnetic field B perpendicularly, then it moves in a circular path of radius r.
Now, Centripetal force = Magnetic force ⇒mv2r=qvB ⇒r=mvqB Hence, the correct answer is option (1).