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Lesson 1: Magnetlc Fields 1. In the diagram below; a compass is placed under the conductor and the conductor is carrying conventional current from Ate B. In which direction will the compass needle point? / answer here A 2. In the diagram below, a compass is placed over a conductor and the conductor is carrying electrons from B to A. In which direction will the compass needle point? A 3. In the diagram below, the compass Is pointing toward the right side of the page. In which direction is current flowing in the conductor, A to E or E to A? A to In the diagram below, the circle represents the cross-section ofa conductor coming out ofthe page. The direction of the current is represented bi, the dot in the centre of the conductor. In what direction will a compass needle point if it is placed at point P? p. In the diagram, electrons are flowing from Ate B. Which end of the solenoid becomes the north pole?I solenoid becomes the south pole? A In the diagram, the top of the solenoid is the induced north pole. Which way is the current flowing, A to E or B to at? B A B In the diagram, current is flowing from Ate B. Which end of the W] A B 8. Draw the magnetic field lines for the following configurations. Indicate whether the objects experience an attractive or repulsive magnetic force. Do the drawings on a separate piece of paper. (Do not cram them onto this page.) (a) N Is c ) offly S S S 9. A positively charged bullet is fired horizontally from right to left. It recedes away from you, what is the direction of the magnetic field that surrounds it? (upwards) 10. Is the North Magnetic Pole area on Earth a North Pole or a South Pole? Explain using a diagram of the Earth's magnetic field. 11. For the following diagram, what is the direction of the deflecting force if the particle is: A. a proton. B. a fluoride ion. S N Lesson 2: Moving Charges in Magnetic Fields 12. What is the magnetic field strength if a deflecting force of 0.0010 N is produced on a 7.5 mC particle entering the field at 30 with a speed of 30 m/s? (8.89 mT) 13. What deflecting force is exerted on a charge of 40 JC moving at 15 cm/s at 30 to the magnetic field whose flux density is 0.025T? (7.5 x 108 N) 14. What happens to the motion of an electron that is moving in the same direction as (i.e. parallel to) the magnetic field which it enters? 15. What is the deflecting force on an alpha particle moving at 1.0% of the speed of light directly across a magnetic field whose flux density is 0.0030 T? (2.9 x 10-15 N)16. An electron and a proton, each with a speed of 1.2 x 102 m/s enter a magnetic field of 0.0020 T at 90 to the field as shown below. A. Calculate the force on each particle. (3.84 x 10-20 N) N B. Calculate the acceleration experienced by each particle. (4.2 x 1010 m/s2 out of page, O-> 2.3 x 10' m/s' into page) S 17. Calculate the magnitude and direction of the magnetic force on an alpha particle moving south at a speed of 7.40 x 10# m/s through a vertically upward magnetic field of 5.50 mT. (1.30 x 10-16 N west) 18. Current is flowing from A to B. Predict the direction of movement of the conductor. A N 19. Current through the conductor results in a force to the right. Which way is conventional current flowing? N F > S 20. In the diagram below, a 10 cm wire carries a current of 20 A through a magnetic field of 2.0 T. What is the deflecting force on the conductor? (4.0 N into page) S N21. A 40 cm conductor cuts through a magnetic field of 0.50 T at an angle of 60 to the field. If the wire carries a current of 20 A, what is the deflecting force on the conductor? (3.5 N) 22. A single conductor in a power transmission line is 40 m long and carries a current of 80 A from east to west. It lies perpendicularly across the Earth's magnetic field somewhere in Canada. If the Earth's magnetic flux density is 2.0 x 10" T, what is the magnitude and direction of the deflecting force on the transmission line? (6.4 x 10* N down) 23. A conductor which is 30 cm long with a mass of 20 g is suspended horizontally in a magnetic field whose magnetic flux density is 0.12 T. What current is required in order that the magnetic force balances the gravitational force? (5.5 A) 24. If a 45 mg conductor that is 15 cm long is accelerating upward (against gravity) at 4.19 m/s in a 5.0 mT field, how much current must be flowing in the conductor? (0.84 A) 25. Trace out the path of the positive particle in the indicated B (into paper) magnetic field. B 26. Three particles move through a constant magnetic field and follow the paths shown in the drawing. Determine whether each particle is 13 12 positive, negative, or neutral. Give reasons for your answers. B (into paper] 27. Three particles have identical charges and masses. They enter a constant magnetic field and follow the paths shown in the picture. Which particle is moving fastest, which is moving slowest? Justify your answer.28. A magnesium ion (Mg"*) traveling at 60 000 m/s enters a mass spectrometer with a magnetic field of 0.0800 T at an angle of 90 to the field. What is the radius of the curve followed by the magnesium ion? (9.39 x 10-2 m) 29. The solar wind is a thin hot gas given off by the sun in all directions. Some of the charged particles enter the magnetic field of the Earth and can experience a magnetic force. Suppose some charged particles traveling at 9.0 x 105 m/s encounter the Earth's magnetic field at an angle of 90 where the magnitude of the field is 1.2 x 10"T. Find the radius of the circular path on which the particle would move it were (a) an electron and (b) a proton. (4.3 x 102 m, 7.8 x 105 m) 30. An alpha particle with a speed of 4.4 x 105 m/s moves perpendicular to a 0.75 T magnetic field in a circular path with a radius of 0.012 m. What is the magnitude of the charge on the helium nucleus? (3.2 x 10-19 C) 31. An ion source in a particular mass spectrometer produces deuterons (a deuteron has twice the mass of a proton, but the same charge). Each deuteron is accelerated from rest through a potential difference of 2000 V after which it enters a 0.600 T magnetic field. Find the radius of the circular path. (0.0152 m) 32. A mass spectrometer uses a potential difference of 2.00 kV to accelerate a singly charged ion to the proper speed. A 0.400 T magnetic field bends the ion into a circular path of radius 0.226 m millimeter. What is the mass of the ion? (3.27 x 10-25 kg) 33. (omitted) Lesson 3: Induced Magnetic Fields 34. For each situation to the right, poppop dj determine the polarity of the induced magnetic field and the direction of induced electron flow for each of the following cases. Indicate which end of bj e) the "generator" wire becomes a N negative terminal in each case. (A) N (A] 35. An aluminum airplane is flying west, parallel to the ground, at 350 m/s. The Earth's magnetic field produces a downward component of 8.0 x 10" T. For this question, treat the wing as a conducting rod. Which wing tip would be negatively charged, the wing on the north side or the south side of the plane? Support your answer with a diagram. (the north side)36. A positivelyr charged sphere is suspended between two large metal plates as shown in the diagram. A wire is placed between the poles of a horseshoe magnet and connected to the metal plates. IWhen the wire is drawn horizontally:r to the right the charged ball is observed to swing toward the righthand metal plate. a} Determine the direction of the induced electron flow in the wire in the horseshoe magnet. Explain. b} Is the top pole of the magnet a north pole or a south pole? Explain