Electrostatics Practice
10 problems · instant feedback · full explanations
Like charges repel, opposites attract, and force follows the inverse-square law. Keep track of signs — they carry the physics.
Q1.
What is the SI unit of electric charge?
Multiple choice · Easy
Q2.
A positively charged rod is brought near a neutral balloon. What happens?
Multiple choice · Easy
Q3.
What is the force between two 2 µC charges 0.5 m apart? (k = 8.99×10⁹ N·m²/C².)
Numerical answer (N) · Medium
Q4.
Two charges attract with 36 N at 1 m separation. What is the force at 3 m?
Multiple choice · Medium
Q5.
If one of two charges is doubled (distance fixed), the force:
Multiple choice · Medium
Q6.
Two identical charges 0.1 m apart repel with 0.9 N. What is each charge in coulombs? (k = 8.99e9.)
Numerical answer (C) · Hard
Q7.
Charging by friction transfers electrons between objects; total charge is conserved.
True / False · Easy
Q8.
When an object becomes positively charged, protons move onto it.
True / False · Medium
Q9.
A neutral metal sphere can be given a net charge without touching the charging rod by:
Multiple choice · Hard
Q10.
Find the force between a 2 µC and a 3 µC charge separated by 0.1 m. (k = 8.99×10⁹ N·m²/C².)
Numerical answer (N) · Hard