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An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii r e , r p , r α respectively in a uniform magnetic field B . The relation between r e , r p , r α is :

1. r e > r p = r α
2. r e < r p = r α
3. r e < r p < r α
4. r e < r α < r p Students may find similar question in CP exercise sheet : [ JEE Main, Chapter : Magnetic Effect of Current, Exercise # 5 (A),Q. No.4 ]

Correct answer: r e < r p = r α

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