Magnetic field, physics question?

1. A positive charge of 0.25 C moves horizontally to the right at a speed of 200 m/s and enters a magnetic field directed vertically downward. If it experiences a force of 20 N, what is the magnetic field strength? 2.A horizontal magnetic field of 0.0001 T is at an angle of 30o to the direction of the current in a... show more 1. A positive charge of 0.25 C moves horizontally to the right at a speed of 200 m/s and enters a magnetic field directed vertically downward. If it experiences a force of 20 N, what is the magnetic field strength?
2.A horizontal magnetic field of 0.0001 T is at an angle of 30o to the direction of the current in a straight, horizontal wire 75 cm long. If the wire carries a current of 15 A, what is the magnitude of the force on the wire?
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