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Q.

A proton having kinetic energy ‘K’ is moving in a circular orbit of radius ‘R’ in a uniform magnetic field. Then the radius of an  α-particle moving in a circular orbit with same kinetic energy in same magnetic field will be ______

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a

R

b

R2

c

R4

d

2R

answer is A.

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Detailed Solution

For the proton,12.  meBm. R2  = KFor the  α−particle,K=12.  4m.2e.B4m2 .  R12                                                                       R1=R
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