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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 $e=1.60 \times 10^{-19}\text{ C}.$

1.2 \times 10^{4}

1.7 \times 10^{6}

1.9 \times 10^{7}

1.4 \times 10^{6}

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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 $e=1.60 \times 10^{-19}\text{ C}.$

5000 100 2500 500

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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}

3.75 \times 10^{19}

4.69 \times 10^{18}

5.63 \times 10^{17}

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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 $e=1.60 \times 10^{-19}\text{ C}.$

8.8 \times 10^{11}

4.4 \times 10^{11}

4.4 \times 10^{12}

8.8 \times 10^{12}

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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

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by Brilliant Staff