Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: If Oxygen ion \( \mathrm{O}^{-2} \) and Hydrogen ion \( (\mathrm{H}^{+} )\) enter normal to the magnetic field with equal momentum, then the path of \( \mathrm{O}^{-2} \) ion has a smaller curvature than that of \( \mathrm{H}^{+} \).
Reason R: A proton with same linear momentum as an electron will form a path of smaller radius of curvature on entering a uniform magnetic field perpendicularly.
In the light of the above statements, choose the correct answer from the options given below:
