WorksheetsEM review AP Penner 1
Total questions: 20
Worksheet time: 34mins
Current runs through the wire as shown. In which direction will the compass point?
W
X
Y
Z
A magnet approaches an aluminum ring as shown. In which direction will the current flow in the portion of the ring shown?
towards 1
towards 2
towards 3
towards 4
A coil moves at a constant velocity across a region of magnetic field as shown. Which of the following best shows the induced emf in the coil as a function of time as it moves from 1 to 2?
Two identical bar magnets are positioned as shown. What is the direction of the net magnetic field and P?
SW
NE
NW
SE
A conductor is moved to the right through four magnetic fields as shown. In which care will the largest emf be generated?
The switch on the left side of the diagram is closed, allowing current to flow through the coil wrapped around the ferromagnetic torus. Which of the following happens just after the switch is closed?
There is a clockwise increase in flux in the torus, and no current flows through the resistor
There is a clockwise increase in flux in the torus, and current flows through the resistor to the left
There is a clockwise increase in flux in the torus, and current flows through the resistor to the right
There is a counterclockwise increase in flux in the torus, and current flows through the resistor to the left
There is a counterclockwise increase in flux in the torus, and current flows through the resistor to the right
A permanent magnet is dropped through a conducting loop as shown. As the magnet falls toward, and then past, the area of the loop, in which direction will current flow?
Clockwise when falling toward; counterclockwise as falling away
Clockwise when falling toward; clockwise as falling away
Counterclockwise when falling toward; clockwise as falling away
Counterclockwise when falling toward; counterclockwise as falling away
A loop of conducting wire with a radius of 0.50 m is inserted into a magnetic field of 4.0 T. Which statement is true immediately after the loop is inserted?
The flux through the loop is 0 webers and current flows in the counterclockwise direction
The flux through the loop is 0 webers and current flows in the clockwise direction
The flux through the loop is 3.14 webers and current flows in the clockwise direction
The flux through the loop is 3.14 webers and current flows in the counterclockwise direction
The flux through the loop is 3.14 webers and the current is zero
A loop of conducting wire with a radius of 0.50 m is inserted into a magnetic field of 4.0 T. Which statement is true a while after the loop is inserted?
The flux through the loop is 0 webers and current flows in the counterclockwise direction
The flux through the loop is 0 webers and current flows in the clockwise direction
The flux through the loop is 3.14 webers and current flows in the clockwise direction
The flux through the loop is 3.14 webers and current flows in the counterclockwise direction
The flux through the loop is 3.14 webers and the current is zero
Two wires, 1 and 2, carry currents I1 and I2, respectively and are a distance d apart. I1 flows to the right, and point P is a distance d/4 from wire 1. How much current, and in what direction must I2 flow so that the net magnetic field at P is zero?
I2=4I1 to the right
I2=4I1 to the left
I2=3I1 to the right
I2=3I1 to the left
An electron travels through a regions of space with a magnetic field in the -z direction as shown. If the magnetic force due to the field is in the +y direction, the velocity of the particle must be in which direction?
+y
-y
+x
-x
+z
A 200-turn coil has a 15.2 V potential difference induced in it when the magnetic field changes from 0.42 T to 0.22 T in 0.032 s as shown. What is the radius of the coil?
0.035 m
0.051 m
0.059 m
0.062 m
A charged particle of mass m is exposed to a constant magnetic field of magnitude B and directed out of the page, in which the particle moves in a clockwise circle of radius R with a speed v, as shown. If the particle were to move with a speed 2v and the magnetic field was reversed, which of the following statements would be true?
The particle now travels in a clockwise circle of radius R
The particle now travels in a counterclockwise circle of radius R
The particle now travels in a counterclockwise circle of radius 2R
The particle now travels in a clockwise circle of radius R/2
The particle now travels in a counterclockwise circle of radius R/2
What is the magnitude of the net force on the conductor?
0.061 N
0.081 N
0.010 N
0.14 N
The current, I, in a long wire changes with time as indicated in the graph. A square wire loop is placed near the wire as shown in the diagram. During which phase(s) is there an induced current, i, the square loop? Click all that apply.
A
B
C
D
E
The current, I, in a long wire changes with time as indicated in the graph. A square wire loop is placed near the wire as shown in the diagram. During which phase(s) is there a clockwise induced current, i, the square loop? Click all that apply.
B
C
E
There is never a clockwise induced current
Six identical rectangular wire loops are moving to the right at the same constant speed. There is a uniform magnetic field coming out of the page in the region enclosed by the dashed line. Which loop(s) has no induced current? Check all that apply.
A
B
C
D
E
Three conductors - X, Y, Z - carry the same amount of current either into the page or out of the page as shown. In which instance is the magnitude of the magnetic field at point P the greatest?
A
B
C
D
E
Four charged particles, all with the same mass and same initial speed, are projected initially parallel to four identical current-carrying wires. In which instance is the initial acceleration the greatest?
A
B
C
D
What is the secondary voltage and what kind of transformer is this?
120 V step-down
120 V step-up
480 V step-down
480 V step-up
