NEET 2020
Physics
Memory Based
Q. A proton is accelerating in a cyclotron where the applied magnetic field is 2 T.
If the potential gap is effectively 100 kV then how many revolutions the proton has
to make to acquire a kinetic energy of 20 MeV?
Solution:
Energy gained per revolution = 2 × 100 × 103 eV
= 2 × 105 eV
Required energy = 20 MeV = 2 × 107 eV
Number of revolutions =
(2 × 107) / (2 × 105) = 100