A current - carrying wire is placed inside a magnetic field as shown. The magnetic flux density of the magnetic field is 2 . 4 × 1 0 - 4 T . If the length of the wire inside the magnetic field is 1 2 cm and the current flowing is 8 5 0 mA then: a Calculate the size of the force acting on the wire. b State and explain the direction that the wire will move in .