List of top Physics Questions on Magnetic Field asked in AMUEEE

The maximum velocity to which a proton can be accelerated in a cyclotron of $ 10\, MHz $ frequency and radius $ 50\, cm $ is

An electron having charge $1.6 \times 10^{-19} C$ and mass $9 \times 10^{-31} kg$ is moving with $4 \times 10^{6} m / s$ speed in a magnetic field of $2 \times 10^{-1} T$ in a circular orbit. The force acting on an electron and the radius of circular orbit will be