1. The diagram below shows the end of a solenoid, with magnetic field directed into the page inside the solenoid loop. X X X X X X X X X X X X In which direction is the conventional current travelling around the solenoid loop? 1 . Clockwise 1 mark 2. In the diagram below, a straight wire shows conventional current travelling to the left. A small compass is placed directly over the wire. In which direction will its needle point? compass over wire current-carrying wire" 2 . 1 mark 3. A solenoid is wound with 50 turns per cm. What current is required in the solenoid to produce a magnetic field of strength 6.30 x 10-2 T? 6,3 x10-2 = (4 JC #10-?)( 5,000) ( I ) I = 10,03 3. I= 10 A 3 marks Page 2 of 107. In the diagram shown, an electron is sent between charged plates at a speed of 8.00 x 10 m/s. 2.50 x 103 m 645 V v = 8.00 x 106 m/s a) Determine the electric field between the plates. E = BLV V= E B 64 5 = B ( 2.5 * 103 ) (8+ 106) E= 645(3,23+10 ? ) 20, 8 N/C B = 3. 23 +10-2 E = 20,8 2 marks A magnetic field is set up between the charged plates in such a way that the electron passes through un-deflected. . draw field v = 8.00 x 10 m/s 10 direction here + + b) In which direction do the magnetic field lines point within the charged plates? Draw directly in the box on the diagram above. 2 marks out of page c) Determine the magnitude of this magnetic field that counters the electric field and allows the electron to pass through un-deflected. b) 3 marks Page 6 of 109. 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 ) attract 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 force the wires to move towards each other. b ) 1 mark 10. 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. F = 1 84 ( 3. 7 ) 1.05 ) = . 16 b) 2 marks Page 8 of 101. A horizontal copper conductor of mass 8.4 g and length 13 cm is suspended in mid-air when placed within and perpendicular to a magnetic field of strength 5.0 x 10" T. power supply X X X X X X X m = 8.4g X X X X X X 4----13 cm -- --> X X X X X X X X X X B = 5.0 x 102T a) What current is flowing through the conductor so that it remains suspended in this magnetic field? BV LV I = ? a) 4 marks b) In which direction does the current flow in the wire? Show this direction on the diagram. 1 mark Page 9 of 10