Assertion: A proton an an alpha particle having the same kinetic energy are moving in circular paths in a unifrom magnetic field. The radii of their circular paths wll be equal.
Reason: Any two charged particles having equal kinetic energies and entering a region of unifrom magnetic feild `vec(B)` in a direction perpendicular to `vec(B)`, will describe circular trajectoreis of equal radii.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : A proton and an alpha particle having the same kinetic energy are moving in ircular paths in a uniform magnetic field. the radii of the ciruclar paths will be equal Reasons: Any two charged particles having equal kinetic energies and entering a region of uniform magnetic field vecb in a direction perpendicualr to the vecb , will describe circular trajectories of equal radii.

A proton, a deuteron and alpha -particle, whose kinetic energies are same, enter perpendicularly a uniform magnetic field. Compare the radii of their circular paths.

A proton, a deuteron and alpha -particle, whose kinetic energies are same, enter perpendicularly a uniform magnetic field. Compare the radii of their circular paths.

A proton, a deutron and alpha -particle, whose kinetic energies are same, enter perpendicularly a uniform magnetic field. Compare the radii of their circualr paths.

A proton, a deutron and alpha -particle, whose kinetic energies are same, enter perpendicularly a uniform magnetic field. Compare the radii of their circualr paths.

A proton, a deutron and alpha -particle, whose kinetic energies are same, enter perpendicularly a uniform magnetic field. Compare the radii of their circualr paths.

A proton and an alpha -particle are projected with the same kinetic energy at right angle to a uniform magnetic field. The ratio of the radii of their paths is