Forces and Fields

Electric charge, electric and magnetic fields, and the devices that put them to work.

9 questions, free, marked as you go with a worked explanation on every one.

What this covers

According to Coulomb's law, if the distance between two charges is doubled, the force between them becomes
Two charges of 2.0 μC and 3.0 μC sit 0.10 m apart. What is the force between them? Use k = 8.99 × 10⁹ N·m²/C².
In which direction does an electric field point?
A charge of 4.0 μC sitting in an electric field experiences a force of 0.60 N. What is the electric field strength at that point, in newtons per coulomb?
A charged particle moves parallel to a magnetic field. What magnetic force does it experience?
What does Faraday's law of electromagnetic induction describe?
Which statements about electric field lines are correct? Select all that apply.
Why does a transformer only work with alternating current?
Use the table. Which relationship between distance and force does the table show?