Practice Problems

New Problems reloads the page with new variable values in all questions. You must do this after grading the test to rework it another time.
Make sure to enter your answers in the specified units .
Two charges are attracting each other. They are separated by 1.0 meter. The force of attraction is Newtons. If the distance between the charges is increased to 3.0 meters, what will be the magnitude of the force of attraction (in Newtons)?

Two charges are attracting each other with a force of Newtons. If the magnitude of one of the charges is doubled, the new force will be how many Newtons?

A charge of x10^-6 Coulomb is being repelled by another charge of x10^-6 Coulomb. What is the magnitude of the force, assuming the charges are separated by 23.4 cm?

A metallic spehere has a charge of + Coul. Another identical sphere has a charge of - Coul. They are brought into contact and then separated. How much charge is on the first sphere after they are separated?

A piece of metal has a charge of - Coul. How many excess electrons are there on that piece of metal?

Once you have submitted your answers for grading by clicking the grade button, you cannot resubmit answers for the same Problem Set--you must use the 'New Problems' button first.
Need help? Try these test-taking tools:
Constants Conversions calculator