Question

Arthur Jeffries1 finds that a proton moving with a velocity of 1.45 × 106 m/s in a
particular uniform magnetic field experiences a force of 5.11×10−17 N. If the direction
of the velocity vector is at a right angle to the direction of the magnetic field, calculate
the magnitude of the magnetic field and express your answer in units of gauss (recall
that 104 G = 1 T).