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A positive charged particle of mass m an...

A positive charged particle of mass m and charge q is projected with velocity v as shown in the figure. If radius of curvature of charged particle in magnetic field is `R(2dltRlt3d),` then time lapse by charged particle in magnetic field regions is :

A

`m/(2qB)`

B

`2m/(qB)sin^(-1)(d/R)`

C

`m/(qB)`

D

`m/(qB)sin^(-1)(d/R)`

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The correct Answer is:
B
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