Waste less time on Facebook — follow Brilliant.
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Charges and Their Interactions
The motion of charged matter underlies many things we enjoy like phones and plasma globes. It also puts a permanent end to the enjoyment of some 6,000 people per year, as fatal lightning strikes.
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Concept Quizzes
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 \(e=1.60 \times 10^{-19}\text{ C}.\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
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 \(e=1.60 \times 10^{-19}\text{ C}.\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
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 \(e=1.60 \times 10^{-19}\text{ C}.\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
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 \(e=1.60 \times 10^{-19}\text{ C}.\)
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
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 \(e=1.60 \times 10^{-19}\text{ C}.\)