Electricity and Magnetism Quiz

Ten Electricity and Magnetism practice questions cover calculations and concepts. Every answer is explained.

Free, with no sign-up.

For High school students and adults reviewing the topic.

About 14 minutes. 10 questions.

How does it work?

Choose one answer or enter a number in the stated unit, then check it.
Round only the final answer to the precision requested.

What will you get?

Review a score and an explanation for every answer.

Question 1An ideal 18 V source is connected to a 9 Ω resistor. Find the current in A, rounded to two decimals.

Enter a number in A.

Answers within 0.005 A of the expected value are accepted.

Question 2Resistors of 7 Ω and 13 Ω are connected in series. Find equivalent resistance in Ω, rounded to two decimals.

Enter a number in Ω.

Answers within 0.005 Ω of the expected value are accepted.

Question 3Resistors of 12 Ω and 18 Ω are connected in parallel. Find equivalent resistance in Ω, rounded to two decimals.

Enter a number in Ω.

Answers within 0.005 Ω of the expected value are accepted.

Question 4Across a component, the voltage is 15 V and the current is 0.8 A. Find its electrical power in W, rounded to two decimals.

Enter a number in W.

Answers within 0.005 W of the expected value are accepted.

Question 5For 80 s, a steady current of 0.35 A passes through a conductor. Find the charge transferred in C, rounded to two decimals.

Enter a number in C.

Answers within 0.005 C of the expected value are accepted.

Question 6A balloon gains electrons during contact with another material. What happens to total charge in the isolated pair?

It changes sign because rubbing reverses the carriers’ polarityIt becomes zero on both objects as the electrons moveIt increases because rubbing creates negatively charged particlesIt is conserved while the distribution between objects changes

Question 7A stationary charged particle is placed in an electric field and a magnetic field. Which field exerts a force on the particle at rest?

Neither field until the particle becomes electrically neutralThe electric field at the particle’s locationThe magnetic field acting on the charge at restBoth fields with equal force because both are present

Question 8An unmagnetized ferromagnetic specimen contains microscopic magnetic moments. Why can its net field be small?

Domains point in directions whose effects largely cancelThe material contains north poles but lacks south polesElectrical insulation prevents each moment from existingIts atoms have lost the electrons that produce magnetism

Question 9A stationary conducting loop develops an electromotive force. Which observation explains it?

The changing flux linkage through the loop’s enclosed areaThe loop’s constant location removing its resistanceThe field exhausting the wire’s supply of mobile carriersThe conductor heating until its resistance vanishes

Question 10A motor’s rotor must keep receiving torque in a useful direction as it turns. What role does switching the current play?

It removes the need for energy from a power sourceIt converts the rotor’s motion into the input’s power supplyIt adjusts the force pattern to the rotor’s changing orientationIt converts the rotor’s mass into magnetic field energy

Answer every question to see and share your score.

Read the topic guide