Electric Field and Potential Practice
10 problems · instant feedback · full explanations
The field is the influence a charge spreads through space: E = F/q. Potential (voltage) is energy per charge — a scalar, easier to work with than vectors.
Q1.
Electric field lines point:
Multiple choice · Easy
Q2.
A 2×10⁻⁴ C charge feels a 0.1 N force in an electric field. What is the field strength?
Numerical answer (N/C) · Easy
Q3.
What is the electric field 0.5 m from a 1 µC point charge? (k = 8.99e9 N·m²/C².)
Numerical answer (N/C) · Medium
Q4.
The electric field inside a hollow charged conductor is:
Multiple choice · Medium
Q5.
Moving 2 C of charge through a potential difference requires 12 J of work. What is the potential difference?
Numerical answer (V) · Medium
Q6.
Two parallel plates 0.05 m apart have 100 V between them. What is the field strength?
Multiple choice · Hard
Q7.
A positive charge released in an electric field moves from high potential to low potential.
True / False · Easy
Q8.
Electric field lines can cross each other.
True / False · Medium
Q9.
An electron (1.6×10⁻¹⁹ C) accelerates through 5000 V. How much kinetic energy does it gain?
Multiple choice · Hard
Q10.
At what distance is the field of a point charge double its value at distance r?
Multiple choice · Hard