Here is a list of concept and typical problems that will be tested in the exam.
1) Magnetism
Permanent magnets,
Magnetic fields created by permanent magnets
Magnetic field lines, B-vector
Orientation of a compass in a magnetic field
Magnetic field of the Earth: magnetic poles vs geographic poles.
2) Magnetic fields created by electrical currents
Magnetic fields created by straight wires, loops, solenoids
Right hand rule: I vs B
Determine the poles of loops and solenoids
Calculate the magnetic field(s) due to currents through wires, loops, and solenoids,
3) Magnetic fields exert forces on moving charges
Second right-hand rule: V, B, F or I, B, F
Paths of charged particles in magnetic fields
4) Magnetic fields exert forces on currents
Forces between currents
5) Magnetic fields exert torques on magnetic dipoles
Rotation of a loop introduced in externally created magnetic fields
Electrical motor
6) Induced Currents and motional emf
7) Induced currents in circuits formed by a U-shape wire on which a metal bar slides
Direction and magnitude of I
Magnetic force
Power dissipated; power exerted by the pushing/pulling force
Generators
8) Magnetic flux and Lenz’s law
Find the direction of the induce current in a loop/solenoid through which the magnetic flux changes in time
9) Faraday’s law
Long story short: you will need to know all concepts presented in CH 24 and CH 25, review problems solved during the discussion sessions and in the homework assignments.
Quiz: Practice Exam - Midterm Exam 3 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 1 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take Practice Exam - Midterm Exam 3 Started: Nov 13 at 2:53pm Quiz Instructions For the exam you must: 4 ptsQuestion 1 Path c Path a non of the paths provided A negatively charged particle is moving to the right, as shown in the figure. Suddenly it encounters uniform magnetic field pointing out of the page. Which one of the three paths shown will it follow in the field? e https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 2 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take Path b 4 ptsQuestion 2 There is no current, because no power supply is connected right to left left to right out of the page into the page A 1 kg horizontal aluminum bar, 0.1 m long, is pushed by a force F between two vertical metal rods that are 0.1 m apart. A 0.1T magnetic field is directed perpendicular to the plane of the rods as indicated. A 5 Ω resistor is connected across the two rods at the bottom. What is the direction of the current through the aluminum bar? https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 3 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take 10 ptsQuestion 3 An aluminum bar moves with a speed 6m/s between two copper roads in a magnetic field of 5T as indicated on the figure. The distance between the cooper roads is 7m. The aluminum bar is always in contact with cooper roads and moves without friction. A voltmeter is coupled between the roads. What is the potential measured by the voltmeter (in volt), if the resistance of the rods and aluminum bar are consider to be negligible? 10 ptsQuestion 4 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 4 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take An aluminum bar moves with a speed 2.46m/s between two copper roads in a magnetic field of 0.2T as indicated on the figure. The distance between the cooper roads is 0.5m. The aluminum bar is always in contact with cooper roads and moves without friction. A resistor with a resistance of 4ohm is coupled between the roads. Consider that the resistance of the copper rods and aluminum bar are zero ohms? What is the power dissipated by the resistor in Watt? (if the right answer is 4.4x10 W, you will need to input 0.0044) -3 15 ptsQuestion 5 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 5 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take Two vertical copper wires carry a current I =4A while two horizontal cooper wires carry a current I =74A as indicated on the drawing. Calculate the magnitude of the magnetic field in Tesla at the blue dot, which is positioned at distance d1=2.90m from the vertical wires and distance d2=6.0m from the vertical wires. Provide your answer in 10 T (for instance if your answer is 2.45*10 T, you will need to input 2.45 in the answer box) 1 2 -6 -6 15 ptsQuestion 6 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 6 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take Calculate the total magnetic force on Wire 2, if I=39A, d=7.2m and the length of all wires is 1m. Please provide your answer in Newtons (if the right answer is "1.5x10 N" you need to input "1500" or if the right answer is "2.5x10 N" you need to input "0.025") 3 -2 4 ptsQuestion 7 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 7 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take The distance between the solenoid an magnet does not change The distance between the solenoid an magnet must increase The is no current flowing through the meter The magnet is inserted into the solenoid The distance between the solenoid an magnet must decrease The magnetic field lines produced by the solenoid are indicated on the drawing. What statement is correct? 4 ptsQuestion 8 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 8 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take The current through the meter goes from left to right The bar magnet does not move There is no current in the solenoid The current through the meter goes from right to left The magnetic field lines produced by the solenoid are indicated on the drawing. What statement is correct? 4 ptsQuestion 9 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 9 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take There is a clockwise induced current in the loop. The magnetic flux through the loop does not change There is a counterclockwise induced current in the loop. There is no induced current in the loop. The magnetic field is confined to the blue region; it is zero outside. The metal loop is being pulled into the magnetic field. Which is true? 4 ptsQuestion 10 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 10 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take No answer text provided. There is no induced current in the second loop. The second loop has a counterclockwise current. The second loop has a clockwise current. A battery, a loop of wire, and a switch make a circuit as shown. A second loop of wire sits directly above. A short time after the switch is closed, 4 ptsQuestion 11 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 11 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take in the direction of the magnetic field in the opposite direction of the magnetic field The force is zero perpendicular to CD and into the page perpendicular to CD and out of the page A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section CD of this coil? 4 ptsQuestion 12 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 12 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take The loop has no current The loop has a counterclockwise current No answer text provided. The loop has a clockwise current A magnetic field goes through a loop of wire, as shown. If the magnitude of the magnetic field is decreasing 4 ptsQuestion 13 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 13 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take No force or torque A downward force An upward force A torque Immediately after the switch is closed, the lower loop exerts on the upper loop 4 ptsQuestion 14 A compass is placed at the black dot. In which direction will the compass point? https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 14 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take B E D A C 4 ptsQuestion 15 To the left To the right Down Up The diagram below shows slices through two adjacent current loops. Think about the force exerted on the loop on the right due to the loop on the left. The force on the right loop is directed https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 15 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take 4 ptsQuestion 16 Do something not listed here Move upward Rotate clockwise Rotate counterclockwise Move downward If released from rest, the current loop will 4 ptsQuestion 17 https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take# 11/13/22, 2:56 PMQuiz: Practice Exam - Midterm Exam 3 Page 16 of 16https://webcourses.ucf.edu/courses/1414264/quizzes/2314233/take Quiz saved at 2:55pm Clockwise There is no induce curent in the loop No answer text provided. Counterclockwise. A current-carrying loop sits between the poles of a magnet. Magnetic forces rotate the loop as shown in the figure. From the point of view of the north pole of the magnet, the current in the loop is Submit Quiz