A proton is moving in the -x direction with a speed of 389 km/s through a region containing a uniform 2.12 T magnetic field that points in the -y direction. What is the magnitude of the magnetic force on the proton?

Two long parallel wires each carry a current of 6.8 A in opposite directions. The two wires are separated by 8 cm. What is the magnitude of the magnetic field ( in µT) at the midpoint between the wires?

A particle with charge 4.16 x 10^-6 C moves at 5.78 x 10^6 m/s through a magnetic field of strength 2.58 T. The angle between the particle s velocity and the magnetic field direction is 35.1 degrees and the particle undergoes an acceleration of 11.9 m/s^2. What is the particle s mass?  17.9 kg   3.00 kg  6.0 kg  7.1 kg

Two long parallel wires are separated by 16.1 cm. The wire on the left carries a current of 24.5 A and the wire on the right carries a current of 6.70 A but the two currents flow in opposite directions. What is the magnetic field magnitude at the midway point between them? Give your answer in μT.