Slide 1 / 22 AP Physics C Sources of Magnetic Field Multiple Choice Slide 2 / 22 1 Two long parallel wires are separated by distance R carrying two currents, I 1 and I 2 respectively. To increase the force exerted on each wire by two times as much, you could: I. Double the current and double the separation II. Double one current only and keep the separation same III. Keep the currents the same and halve the separation A I only I & II B I & III C D II & III I, II & III E Slide 3 / 22 2 Two long, parallel wires, fixed in space, carry current I 1 and I 2 . The force of attraction has magnitude F. Waht currents will give an attractive force of magnitude 4F? 2 I 1 and 1/2 I 2 A I 1 and 1/4 I 2 B C 1/2 I 1 and 1/2 I 2 2 I 1 and 2 I 2 D 4 I 1 and 4 I 2 E
Slide 4 / 22 3 A solid cylindrical conductor of adius R carries a current I uniformly distributed throughout its interior. Which of the following graphs best represents the magnetic field intensity as a function of r, the radial distance from the axis of the cylinder? D E A B C Slide 5 / 22 4 The cross section below shows a long solenoid of length l and radius r consisting of N closely wound turns of wire. When the current in the wire is I, the magnetic field within this solenoid has magnitude B o . A solenoid with the same number of turns N, length l , and current I, but with radius 2r, would have a magnetic field of magnitude most nearly equal to A B o /4 B o /2 B B o C 2B o D E 4B o Slide 6 / 22 5 Two very long parallel wires carry equal currents in the same direction into the page, as shown below. At point T, which is 10 cm from each wire, the magnetic field is A zero directed into the page B directed out of the page C directed to the left D E directed to the right
Slide 7 / 22 6 Two long wires carrying currents in the same direction are placed next to each other. Which of the following is true? A The wires will remain in place The wires will rotate clockwise B The wires will rotate counter-clockwise C D The wires will attract each other The wires will repel each other E Slide 8 / 22 7 A current I, uniformly distributed over the cross section of a long cylindrical conductor of radius a, is directed as shown below. Which of the following graphs best represents the intensity of the magnetic field B as a function of the distance r from the axis of the cylinder? A C B E D Slide 9 / 22 8 Which of the following equations implies that it is impossible to isolate a magnetic pole? A B C D None of the above E
Slide 10 / 22 9 Questions 9-10 Two long, parallel wires are shown below. Initially, the wires are a distance d apart and each has a current I directed into the page. The force per unit length on each wire has magnitude F o . The direction of the force on the right-hand wire due to the current in the left-hand wire is A to the right B to the left upward in the plane of the page C downward in the plane of the page D into the page E Slide 11 / 22 10 Questions 9-10 Two long, parallel wires are shown below. Initially, the wires are a distance d apart and each has a current I directed into the page. The force per unit length on each wire has magnitude F o . The wires are moved apart to a separation of 2d and the current in each wire is increased to 2I. The new force per unit length on each wire is A F o /4 F o /2 B C F o 2F o D 4F o E Slide 12 / 22 11 Two long parallel wires are a distance 2a apart, as shown below. Point P is in the pane of the wires and a distance a from wire X. When there is a current I in wire X and no current in wire Y, the magnitude of the magnetic field at P is B o . When there are equal currents I in the same direction in both wires, the magnitude of the magnetic field at P is 2B o /3 A B o B C 10B o /9 D 4B o /3 2B o E
Slide 13 / 22 12 A rigid, rectangular wire loop ABCD carrying current I 1 lies in the plane of the page above a very long wire carrying current I 2 as shown below. The net force on the loop is A toward the wire away from the wire B toward the left C toward the right D zero E Slide 14 / 22 13 A cross section of a long solenoid that carries current I is shown below. All of the following statements about the magnetic field B inside the solenoid are correct EXCEPT: A B is directed to the left. An approximate value for the magnitude of B may be B determined by using Ampere's law. C The magnitude of B is proportional to th current I. The magnitude f B is proportional to the number of turns of D wire per unit length. The magnitude of B is proportional to the distance from the E axis of the solenoid. Slide 15 / 22 14 In which of the following cases does a nonzero magnetic field exist that can be conveniently determined by using Ampere's law? A Outside a point charge that is at rest B Inside a stationary cylinder carrying a uniformly distributed charge C Inside a very long current-carrying solenoid D At the center of a current-carrying loop of wire E Outside a square current-carrying loop of wire
Slide 16 / 22 15 Questions 15-16 The figure below depicts a wire that has been bent into a semi-circle of radius R in one section. A current I passes through the wire. What direction does the magnetic field point at the center of the semi-circle. A To the right To the left B C Out of the page Into the page D Downward E Slide 17 / 22 16 Questions 15-16 The figure below depicts a wire that has been bent into a semi-circle of radius R in one section. A current I passes through the wire. What is the magnitude of the magnetic field at the center of the semi-circle? A B 0 C D E Slide 18 / 22 17 Questions 17-19 A magnetic field is created by a current I that runs through the circular loop as shown below. Which of the following represents the magnetic field strength at the center of the loop? A zero B C D E
Slide 19 / 22 18 Questions 17-19 A magnetic field is created by a current I that runs through the circular loop as shown below. Which of the following represents the magnetic field strength at a distance x away from the loop? A zero B C D E Slide 20 / 22 19 Questions 17-19 A magnetic field is created by a current I that runs through the circular loop as shown below. Where is the strength of the magnetic field the largest? A At a distance x away from the loop At a distance a away from the loop B C At a distance 2a away from the loop At a distance 2x away from the loop D E At the origin Slide 21 / 22 20 A cross section of a long, cylindrical conductor of radius R 2 has a current uniformly distributed as shown below. Which of the following represents the magnetic field at a distance R 1 <R<R 2 ? A zero B C D E
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