⚛️ Physics Quiz 16: Electric Charge and Electric Fields

by

⚛️ Physics · Quiz 016

Begin electromagnetism with charge, Coulomb force, electric fields, and conductor equilibrium before introducing potential.

Learning goalUse Coulomb's law and electric-field reasoning to determine force magnitudes and directions under clearly stated electrostatic conditions.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationWhich statement about electric charge is correct?
Need a small nudge?

Recall the basic interaction rule for the two signs of electric charge.

UnderstandingFor a conductor in electrostatic equilibrium, which statement is correct about the electric field inside the conducting material?
Need a small nudge?

If a nonzero internal electric field persisted, free charges in the conductor would continue to move.

ApplicationTwo point charges +2.0 microC and -3.0 microC are 0.30 m apart in vacuum. Using k = 8.99 x 10^9 N m^2/C^2, what is the magnitude and character of the electrostatic force between them?
Need a small nudge?

Use F = k |q1 q2|/r^2, then use the signs only to determine attraction or repulsion.

InterpretationEqual-magnitude point charges +Q and -Q lie on a horizontal line, with +Q on the left and -Q on the right. What is the direction of the net electric field at the midpoint between them?
Need a small nudge?

At the midpoint, draw the field direction produced separately by each charge using a positive test charge.

ConnectionA point charge Q = +4.0 microC creates an electric field at a point 0.30 m away in vacuum. A test charge q = -2.0 nC is placed there. Which result is closest?
Need a small nudge?

Find E = k|Q|/r^2 first. Then use F = qE and remember that a negative test charge feels force opposite the field direction.

© 2026 The Perpetually Curious! All rights reserved.