1. A magnetic field of 3.6 T [down] is 3.0 m wide. Find the magnetic force on a proton moving at 4.2 x 105 m/s [east] in the field. Charge of a proton = 1.6x10-18C (4 marks) 2. Two identically charged particles separated by 5 cm repel each other with a force of 80 mN. Determine the repulsive force if the separation distance changes to 20 cm. (4 marks)3. A satellite is in circular orbit at a height of 5.0x 10'm above the earth's surface. The radius of the earth is 6.38x10'm and the mass of earth is 5.98x102*kg. a) Find the speed of the satellite. b) Find the gravitational field strength at this altitude. (6 marks)