Practice Electric Charge in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A fundamental property of matter that causes it to experience a force in an electromagnetic field. Measured in coulombs (C).
Some particles carry an invisible 'label' — positive or negative — that makes them push or pull on each other.
Showing a random 20 of 50 problems.
Example 1
mediumIf electrons flow past a point each second, what current does this represent?
Example 2
easyHow many coulombs of charge are carried by electrons?
Example 3
hardA copper wire carries a steady . How many electrons pass a cross-section in ?
Example 4
challengeA wire carries a steady current that delivers C every s. How many electrons pass per second?
Example 5
mediumA sphere carries . How many excess electrons does it carry?
Example 6
challengeTwo identical spheres carry C and C. They touch and separate, then the C sphere (now equalized) touches a third identical sphere that was neutral. What charge ends on the third sphere?
Example 7
easyHow many electrons make up approximately one coulomb of charge?
Example 8
hardA wire delivers a current that rises linearly from to over . How much charge passes in that interval?
Example 9
easyCharging a balloon by rubbing it transfers electrons. Is new charge created?
Example 10
easyA proton and an electron are released from rest near each other. What kind of force do they feel?
Example 11
easyFill in the blank: charge is measured in ____.
Example 12
easyTwo objects both carry positive charge. Do they attract or repel?
Example 13
mediumA point passes every . What current does this correspond to?
Example 14
mediumSphere A has C and touches identical sphere B with C. After contact, what charge does each carry?
Example 15
easyA neutral atom loses one electron. What is its net charge?
Example 16
challengeA capacitor plate holds . A student claims the opposite plate must hold exactly by conservation. Is this strictly required by conservation of charge alone? Explain.
Example 17
mediumA current of mA flows for s. How much charge passes, in coulombs?
Example 18
easyIf C of charge passes a point in s, is this asking about charge, current, or voltage?
Example 19
easyA positive charge and a negative charge are brought near each other. Do they attract or repel?
Example 20
easyAn object gains extra electrons. What is the sign of its net charge?