An electron is moving at a speed of 2.1 ´ 107 m/s in a circular orbit in a uniform 1.2 ´10-3 -T magnetic field perpendicular to the velocity of the electron. Find:
(I) the size of the force acting on the electron.
(II) State the direction of the force. [Charge of electron = -1.6 ´ 10-19 C]
(b) The two wires supplying DC power to a heavy-duty machinery workshop carries 800 A and are separated by 75.0 cm. Find:
(I) the magnitude of the force between 50.0 m length of these wires.
(II) State whether the force attractive or repulsive
[Permeability of free space = 4π ´ 10-7 H/m]