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← Topic 18 overviewTOPIC 18 ASSESSMENT

Electric fields

CIE-style questions assess Coulomb's law, electric field strength, potential, energy, equipotentials and charged-particle motion.

Objective question 1

Coulomb's law says point-charge force varies with separation r as:

Objective question 2

Electric field strength is defined as:

Objective question 3

For parallel plates, uniform field strength is:

Objective question 4

Electric potential is a:

Objective question 5

Field lines cross equipotential surfaces:

Structured question 1

Two +2.0 μC charges are 0.30 m apart. Calculate the Coulomb force using k = 8.99 × 10⁹.

Structured question 2

A potential difference of 500 V is across parallel plates 0.025 m apart. Calculate field strength.

Structured question 3

Calculate kinetic energy gained by an electron accelerated through 1.5 kV. Use e = 1.60 × 10⁻¹⁹ C.