Excel in math and science.

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

Your answer seems reasonable. Find out if you're right!

That seems reasonable. Find out if you're right!

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

Electricity and Magnetism

Charges and Their Interactions

Concept Quizzes

Electric charge
Lorentz force (Electric fields)
Coulomb's law
Problem solving - charges and fields

Challenge Quizzes

Charges and Their Interactions: Level 1-2 Challenges
Charges and Their Interactions: Level 3-4 Challenges

Electric charge

A nail with a mass of $17 \text{ g}$ is charged with $- 2.24 \times 10^{-13} \text{ C}.$ How many excess electrons are in the nail?

The elementary charge is $e=1.60 \times 10^{-19}\text{ C}.$

1.9 \times 10^{7}

1.4 \times 10^{6}

1.2 \times 10^{4}

1.7 \times 10^{6}

Show explanation

View wiki

by Brilliant Staff

How many excess electrons are there on a tiny, spherical water drop of charge of $-4.00 \times 10^{-16}\text{ C}?$

The elementary charge is $e=1.60 \times 10^{-19}\text{ C}.$

100 2500 500 5000

Show explanation

View wiki

by Brilliant Staff

If a current of $0.30\text{ A}$ flows for $2.50\text{ min}$ in a conducting wire, approximately how many conduction electrons pass through the wire?

The elementary charge is $e=1.60 \times 10^{-19}\text{ C}.$

2.81 \times 10^{20}

5.63 \times 10^{17}

3.75 \times 10^{19}

4.69 \times 10^{18}

Show explanation

View wiki

by Brilliant Staff

Suppose there is a small (copper) coin with a mass of $25 \text{ g}.$ If we want to leave it with a charge of $+1.4 \times 10^{-7}\text{ C},$ approximately how many electrons must be removed from that metal coin?

The elementary charge is $e=1.60 \times 10^{-19}\text{ C}.$

4.4 \times 10^{12}

4.4 \times 10^{11}

8.8 \times 10^{12}

8.8 \times 10^{11}

Show explanation

View wiki

by Brilliant Staff

If an average current of $0.07\text{ A}$ flows from a conducting sphere for $5\text{ sec}$ and then stops, what can we know about the sphere?

The elementary charge is $e=1.60 \times 10^{-19}\text{ C}.$

The number of electrons inside The number of protons inside The number of neutrons inside The number of excess electrons inside

Show explanation

View wiki

by Brilliant Staff