Assertion (A)When proton and a neutron enter into a transverse magnetic field with equal speeds, then they…
Assertion (A)When proton and a neutron enter into a transverse magnetic field with equal speeds, then they trace a circular paths of equal radii.
Reason (R) In a transverse magnetic field the period of revolution of a charged particle in a circular path is directly proportional to the mass of the particle.
Both \((\mathrm{A})\) and \((\mathrm{R})\) are correct and \((\mathrm{R})\) is the correct explanation of \((A)\).
Both \((A)\) and \((R)\) are correct but \((R)\) is not the correct explanation of \((A)\).
(A) is correct but (R) is not correct.
(A) is not correct but (R) is correct.
Solution
(A) When a proton and a neutron enter into a transverse magnetic field with equal speeds, then they trace circular paths of equal radii.
This statement is not correct because neutron will not move in a circular path as there is no charge on neutron.
So, (A) is not correct but (R) is correct.
Hence, option (4) is correct.