. The diagram below shows the end of a solenoid, with magnetic field directed into the page inside the solenoid loop. In which direction is the conventional current travelling around the solenoid loop? i. Tmark . In the diagram below, a straight wire shows conventional current travelling to the lefi. 4 small compass is placed directly over the wire. In which direction will 1t needle point? . COMpass over wire current-carrying wire : 1 mark . A solenoid s wound with 50 turns per em. What current is required in the solenoid to produce a magnetic field of strength 6.30 x 10~ T? 3 marks Page 2 of 10 4. A student creates a home-made solenoid by wrapping copper wire around a toilet paper dispenser. As shown below, when attached to a power supply of fixed voltage, the solenoid produces a magnetic field within it of 8.40 x 103 T. a) Based on the polarity of the power supply, use the Right-Hand-Rule to determine the north and south pole of the solenoid. Place an 'N' and 'S' directly on the diagram. I mark b) Determine the new strength of the magnetic field if the following parameters are changed: i. The student adds three times as many turns of wire to the solenoid, while the length and current stay the same. I mark ii. The current and turns are kept the same but the coils are spread out so that the solenoid is 1.5 times longer. ii . I mark iii. The current and length is doubled, with 1/4 as many turns in the solenoid. iii. 2 marks Page 3 of 105. An electron travelling to the lefi at 2.2 % 10 m/s enters a magnetic field of 3.0 x 10 T that is directed o page. as shown in the diagram below: . s o 8 . s & 8 8 . o 8 @ e =22 x 10* m/s . s s 8 @ B=30x10T* * @# a} Draw the resultant path the electron takes once it enters the field. f maeck b) Determine the magnetic force that acts on the electron inside the field. b) a 2 marks } What 15 the radius of the path the electron takes once it enters the field? c) I marks Page 4 af 10 d) A proton is now sent with the same speed and direction into the magnetic field. Which of the following correctly describes its path, compared to that of the electron? Check one below. I mark O Same curved path, same radius O Same curved path, smaller radius Same curved path, larger radius O Opposite curved path, same radius O Opposite curved path, smaller radius O Opposite curved path, larger radius 6. A proton enters a magnetic field with a speed of 3.8 x 10" m/s at right angles to the field direction and deflects into a curved path. If the intensity of the field is 1.5 x 10"T, what will be the magnitude of the proton's centripetal acceleration? 6. marks Page 5 of 107. In the diagram shown, an electron is sent between charged plates at a speed of 8.00 x 10 m/s. : iy 250 10 m 645V - : _ v=800 x 10 m's a) Determine the electric field between the plates. aj A magnetic field is set up between the charged plates in such a way that the electron passes through un-deflected. & 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 ) Determine the magnitude of this magnetic field that counters the electric field and allows the electron to pass through un-deflected. b} I marks Page B af 10 8. A copper rod 15 placed i a magnetic field of strength 0.52 T. When a current flows in the wire, it experiences a magnetic force of L2 N, power supply What is the magnitude and direction of the current in the copper rod? 6. 3 marks Page 7 af 10 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. I 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. bj I 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. I mark b) Determine the magnitude and direction of the force that acts on the wire. bj 2 marks Page 8 of 101 1. 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 m = 3.4 X X X X - 13 cm - X X X X X X XX X X X B = 5.0 x 10- T a) What current is flowing through the conductor so that it remains suspended in this magnetic field? a) & marks b) In which direction does the current flow in the wire? Show this direction on the diagram. I mark Page 9 of 1012. The diagram below shows a current balance placed in a solenoid that has 640 turns of wire. The current in the solenoid is z = 3.6 A, and the current flowing in the wire of the current balance is = 4.0 A. All other dimensions are listed on the diagram, as viewed from above "" """ 30cm------- 'I" i M--- 6.5 cm-- - .:+._ i b v s T T | R F"r R r?'f | 3 | Fihiiilee X R 45m 1 i current balance {view is from above) 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 b} Calculate the magnetic force acting on your indicated section of current balance wire. b} 4 marks ] In which direction will this force act? Select one below. 1 ik O into page O out of page Page 10 af 10