8. A copper rod is placed in a magnetic field of strength 0.52 T. When a current flows in the wire, it experiences a magnetic force of 1.2 N. copper rod . B = 0.52 T - - power 18 cm 15 cm F = 1.2 N supply What is the magnitude and direction of the current in the copper rod?9. Two parallel wires carry currents in opposite directions, as shown in the diagram below. a) From each magnetic field produced by their respective currents, determine whether the two wires will attract or repel each other. a 1 mark b) Ignoring their own fields, in which direction should a much stronger external magnetic field be directed (into-page, out-of-page, left, right, up or down) in order to counteract the force the wires currently exhibit. b) 1 mark10. Examine the diagram to the left, showing North South a 5.0 cm-long wire, situated in a magnetic field of 0.84 T, carrying 3.7 A of current into the page. a) Draw 4-5 arrows to show the pattern of magnetic field lines between the two magnets. 1 mark b) Determine the magnitude and direction of the force that acts on the wire. b) 2 marks12. The diagram below shows a current balance placed in a solenoid that has 640 turns of wire. The current in the solenoid is Is = 3.6 A, and the current flowing in the wire of the current balance is Icb = 4.0 A. All other dimensions are listed on the diagram, as viewed from above. - - - - 9.0 cm - - - - + - - 6.5 cm- - Icb = 4.0 A 2.5 cm 4.5 cm current balance (view is from above) Is = 3.6 A a) Clearly circle directly on the diagram the section of current balance wire where a magnetic force will act due to the field of the solenoid. 1 mark b) Calculate the magnetic force acting on your indicated section of current balance wire