Free Practice Quiz Question List

5 Electromagnetic Induction Online Quiz Questions

Use this free practice quiz with 20 questions to review 5 Electromagnetic Induction, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: For a flat surface in a uniform magnetic field, magnetic flux is greatest when the field is parallel to the surface.

A
True
B
False

Choose one

1 point

For a uniform magnetic field through a flat loop, at what angle between the field and the loop’s normal is the magnetic flux greatest?

A
$90^\circ$
B
$0^\circ$
C
$180^\circ$
D
The angle does not affect flux.

Choose one

1 point

A magnetic flux through a conducting loop changes. According to Lenz’s law, how is the induced magnetic field directed?

A
It always points in the same direction as the original magnetic field.
B
It opposes the change in magnetic flux that produced it.
C
It eliminates the magnetic field in the loop.
D
It points opposite to the loop’s motion in every situation.

Choose all

1 point

Select all changes that can change the magnetic flux through a flat loop in a uniform magnetic field.

A
Changing the magnetic field strength through the loop
B
Changing the loop’s area
C
Rotating the loop relative to the field
D
Changing the loop’s electrical resistance
E
Changing the number of turns without changing the field, area, or orientation

Written response

1 point

What is the SI unit of inductance?

True or false

1 point

True or false: In an ideal LC circuit, resistance dissipates the circuit’s energy during each oscillation.

A
True
B
False

Choose one

1 point

The current through an inductor is increasing. What does the inductor’s self-induced emf do?

A
It reinforces the increase in current.
B
It always forces the current to zero.
C
It opposes the increase in current.
D
It has no effect unless the current is decreasing.

Written response

1 point

An inductor has inductance $0.40\,\text{H}$ and carries a current of $3.0\,\text{A}$ . What energy is stored in its magnetic field?

Choose all

1 point

For an ideal LC circuit, select all correct formulas for the oscillation period $T$ and frequency $f$ .

A
$T=2\pi\sqrt{LC}$
B
$T=\frac{1}{2\pi\sqrt{LC}}$
C
$f=\frac{1}{2\pi\sqrt{LC}}$
D
$f=2\pi\sqrt{LC}$

Open ended

1 point

Describe how energy shifts between the capacitor and inductor during one cycle of oscillation in an ideal LC circuit.

Choose one

1 point

A flat loop has area $0.40\,\text{m}^2$ in a uniform $0.50\,\text{T}$ magnetic field. The angle between the field and the loop’s normal is $60^\circ$ . What is the magnitude of the magnetic flux through the loop?

A
$0.20\,\text{Wb}$
B
$0.10\,\text{Wb}$
C
$0.080\,\text{Wb}$
D
$0.050\,\text{Wb}$

Choose one

1 point

In an ideal LC circuit, what happens to the oscillation frequency if the inductance $L$ is increased while the capacitance $C$ is held constant?

A
Increasing either $L$ or $C$ increases the frequency.
B
Changing $L$ or $C$ does not affect the frequency.
C
Increasing either $L$ or $C$ decreases the frequency.
D
The frequency depends only on the maximum charge.

Choose one

1 point

A flat loop is in a uniform magnetic field of strength $B$ and has area $A$ . The angle between the field and the loop's normal is $60^\circ$ . What is the magnetic flux through the loop?

A
$BA$
B
$\frac{1}{2}BA$
C
$0$
D
$\frac{\sqrt{3}}{2}BA$

Choose one

1 point

A magnetic field into the page through a conducting loop is increasing. Which induced current direction and magnetic-field direction follow from Lenz’s law?

A
Clockwise, producing a field into the page
B
Clockwise, producing a field out of the page
C
Counterclockwise, producing a field out of the page
D
Counterclockwise, producing a field into the page

Choose one

1 point

A conducting loop remains stationary with constant area and orientation while the magnetic field through it increases. What happens?

A
An emf is induced because the magnetic flux changes.
B
No emf is induced because the loop is stationary.
C
An emf is induced only if the loop’s area also changes.
D
No emf is induced unless the magnetic field reverses direction.

True or false

1 point

True or false: A stationary conducting loop can have an induced emf if the magnetic field through it changes.

A
True
B
False

Written response

1 point

A 150-turn coil of area $0.020\,\text{m}^2$ is perpendicular to a magnetic field that increases uniformly from $0$ to $0.40\,\text{T}$ in $0.50\,\text{s}$ . What is the average induced emf magnitude? Give the value in volts.

Written response

1 point

An ideal LC circuit has inductance $0.20\,\text{H}$ and capacitance $5.0\,\mu\text{F}$ . What is its oscillation period? Give the value in milliseconds.

Fill in the blank

1 point

A coil’s self-inductance stays constant while its current increases from $2\,\text{A}$ to $6\,\text{A}$ . By what factor does the flux linkage $N\Phi_B$ change? It increases by .

Fill in the blank

1 point

In an ideal LC circuit, the charge is $q(t)=q_0\cos(\omega t+\varphi)$ , with $q_0=12\,\mu\text{C}$ and initial phase $\varphi=\pi/3$ . What is the charge at $t=0$ ? Enter the value with its unit: .