Reason : Magnetic field energy density is proportional to the magnetic field.
Reason : Any two charged particles having equal kinetic energies and entering a region of uniform magnetic field $\overrightarrow B $ in a direction perpendicular to $\overrightarrow B $, will describe circular trajectories of equal radii.


Reason : The magnetic field inside the solenoid is uniform.
Reason : The magnetic field inside the solenoid is uniform.