Slide 1 / 45 Slide 2 / 45 1 A straight wire carries a current into the page. What is the direction of the magnetic field at a point east of the wire? A North B South AP Physics 2 C West Magnetic Field D East Multiple Choice www.njctl.org Slide 3 / 45 Slide 4 / 45 2 Above there is a circular loop of wire that has a counterclockwise 3 The wire above has a current being carried to the right and point P current running through it. What is the direction of the magnetic is a distance r away from the wire. What is the direction of the field inside of the loop? magnetic field at P? A North A Out of the page B South B Into the page C Into the page C Left D Out of the page D Right Slide 5 / 45 Slide 6 / 45 4 The wire above has a current being carried to the right and point P 5 A wire carries current out of the page in a region of magnetic field is a distance r away from the wire. By how much would the directed north. What is the direction of the magnetic force on the magnetic field change if the current was doubled and the distance r current due to the magnetic field? was doubled? A North B South A Doubled C West B Halved D East C Quadrupled D No change
Slide 7 / 45 Slide 8 / 45 6 The wire above has a current I flowing to the left of the page, a 7 The wire above has a current I flowing to the left of the page, a mass m, and a length L. In what direction would a magnetic field mass m, and a length L.If the magnitude of the magnetic field is B have to be placed so that the magnetic force could cancel out the what must the magnitude of this field be to cancel out the gravitational force on the wire? gravitational force on the wire? A Up A mg/IL B Down B m/IL C Out of the page C IL/mg D Into the page D mgL/I Slide 9 / 45 Slide 10 / 45 8 An electron enters a region of uniform magnetic field in the -Z 9 A physics student sets up an experiment with a long wire carrying direction. What is the direction of the magnetic force on the current in the +Y direction and a small ball attached to a thread electron due to the magnetic field? with a charge of -q. Assuming that the student cannot observe or measure changes in tension in what way can the student move the ball so that there will be an observable magnetic force acting on the ball? A +X direction B +Y direction A +X direction C -X direction B +Z direction D -Y direction C +Y direction D -X direction Slide 11 / 45 Slide 12 / 45 10 A horizontal wire is carrying current to the east and a proton is 11 A circular loop of wire carries current in a counterclockwise moving with a velocity v to the west. What is the direction of the direction. The loop is placed in a uniform magnetic field directed magnetic force acting on the proton due to the current carrying into the page. What is the effect of the magnetic force on the loop wire? due to the field? A North A Rotates with respect to its axis B South B Rotates with respect to its diameter C West C Contracts in size D East D Expands in size
Slide 13 / 45 Slide 14 / 45 12 Shown above are two identical bar magnets that are fixed in place 13 A magnetic field is created by the two parallel currents flowing in with a proton moving to the right about to enter the region between opposite directions. At what point is the magnetic field the greatest these two magnets. Which statement below best describes what in magnitude? happens to the proton while travelling in between the magnets? A B B C C D A It curves downward and strikes the bottom magnet D E B The proton continues to move to the right in a straight line C It curves upward and strikes the top magnet D The proton stops and moves to the left in a straight line Slide 15 / 45 Slide 16 / 45 14 A magnetic field is created by the two parallel currents flowing in 15 Two parallel wires carry current in opposite directions. What is the opposite directions. What is the direction of the net magnetic field direction of the magnetic force on the current going into the page at point B? due to the current going out of the page? A Left A Left B Right B Right C Top of the page C Top of the page D Bottom of the page D Bottom of the page Slide 17 / 45 Slide 18 / 45 16 An electron enters a uniform electric field perpendicular to the field 17 An electron enters a uniform electric field perpendicular to the field lines. What must be the direction of the magnetic field in order to lines. What is the magnitude of the magnetic field if the electric cancel the electric force effect? effect completely canceled? A Left A Ev B Right B v/E C Into the page C E/v D Out of the page D Zero
Slide 19 / 45 Slide 20 / 45 18 What is the magnitude of the magnetic field at point B produced by 19 Two parallel wires carry currents I 1 and I 2 in the same direction and a current I if the magnitude of the field at point A is B 0 ? separated by a distance d. The magnitude of the magnetic force between the wires is F 0 . What is the force between the wires if each current is doubled and the separation is quadrupled? A Bo B 2 Bo A 2 Fo C 4 Bo B 4 Fo C Fo D Bo/2 D Fo/2 Slide 21 / 45 Slide 22 / 45 20 Shown above is a mass spectrometer with a positively charged 21 Shown above is a mass spectrometer with a positively charged particle placed in between two charged plates. The magnetic field particle placed in between two charged plates. The magnetic field is uniform and directed out of the page. What is the direction of the is uniform and directed out of the page. In what direction will the electric field between the charged plates? particle move between the charged plates? A Left A Left B Right B Right C Top of the page C Up D Bottom of the page D Down Slide 23 / 45 Slide 24 / 45 22 Shown above is a mass spectrometer with a positively charged 23 An electron with a mass m and a charge e enters a uniform particle placed in between two charged plates. The magnetic field magnetic field B at a velocity v. What is the radius of the curvature is uniform and directed out of the page. Assuming that the particle of the electron in the field? escapes the region between the charged plates and enters the region with the uniform magnetic field, which statement below would best describe the particle’s path in this magnetic field? A mv/eB B eB/mv C me/vB A Semi-circular downward path D mB/ev B Semi-circular upward path C Parabolic downward path D Parabolic upward path
Slide 25 / 45 Slide 26 / 45 24 Shown above is a magnet on the left placed onto an electronic 25 Shown above is a magnet on the left placed onto an electronic balance that gives a reading of 100g. To the right the same magnet balance that gives a reading of 100g. To the right the same magnet is placed on the electronic balance but a wire carrying current into is placed on the electronic balance but a wire carrying current into the page is placed directly in between the north and south ends of the page is placed directly in between the north and south ends of the magnet. To the right the balance now reads 115 g. What would the magnet. To the right the balance now reads 115 g. What is the happen if the current was increased in the wire? direction of the magnetic force acting on the wire? A Left A The balance reading would decrease B Right B The balance reading would increase C Top of the page C The balance reading would stay the same D Bottom of the page D The balance reading would increase for a few seconds and then go back to its original reading Slide 27 / 45 Slide 28 / 45 26 Shown above is a magnet on the left placed onto an electronic 27 One wire is carrying current into the page and the other three wires balance that gives a reading of 100g. To the right the same magnet are carrying current out of the page. The distance between each is placed on the electronic balance but a wire carrying current into wire and point A is r. What is the magnitude and direction of the the page is placed directly in between the north and south ends of magnetic field at point A? the magnet. To the right the balance now reads 115 g. What is the magnitude of the magnetic force acting on the wire? A 2(μ o I/2πr) toward the lower left hand corner A 15 N B 2(μ o I/2πr) toward the upper left hand corner B 1.5 N C (μ o I/2πr) toward the lower right hand corner C 0.15 N D 2(μ o I/2πr) toward the lower right hand corner D 0.015 N Slide 29 / 45 Slide 30 / 45 28 Two wires are both carrying current up towards the top of the page. 29 Both wires above are in parallel with equal currents flowing in What is the interaction between these two wires which results from opposite directions. At what location would the magnetic fields the magnetic fields they create? cancel out? A Anywhere on the line xx’ A Attraction B Anywhere on the line yy’ B Repulsion C Anywhere on the line Ax’ C Magnetic Fields cancel out D At no points on the diagram D None of the above
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