Coulomb’s law & electric fields worksheet with answers

Free printable Coulomb’s law & electric fields worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

New worksheet Practise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________ Date: ____________

1.Easy

An electron (charge −1.602 × 10⁻¹⁹ C, mass 9.109 × 10⁻³¹ kg) is in a uniform electric field of 1600 N/C. Ignoring gravity, find the magnitude of its acceleration a.

E = 1600 N/C|q| = 1.602 × 10⁻¹⁹ Cm = 9.109 × 10⁻³¹ kg

a = m/s²

2.Easy

Two point charges of +3 µC and −8 µC are 30 cm apart. Find the magnitude of the electric force F between them. Use k = 8.99 × 10⁹ N·m²/C².

q₁ = +3 µCq₂ = −8 µCr = 30 cm

F = N

3.Medium

A charge of +3 µC and a charge of −5 µC are 50 cm apart. Point P lies on the line between them, 30 cm from the first charge. Find the magnitude of the electric field E at P.

q₁ = +3 µCq₂ = −5 µCr₁ = 30 cmr₂ = 20 cm

E = N/C

4.Medium

Charges of +6 µC and +4 µC are 100 cm apart. At what distance x from the +6 µC charge, on the line between them, is the electric field zero?

q₁ = +6 µCq₂ = +4 µCd = 100 cm

x = cm

5.Hard

Charges of +3 µC and −3 µC are 20 cm apart. Point P lies 4 cm from the midpoint between them, on the perpendicular bisector. Find the magnitude of the electric field E at P. Use k = 8.99 × 10⁹ N·m²/C².

q₁ = +3 µCq₂ = −3 µCd = 20 cmh = 4 cm

E = N/C

6.Hard

Charges of +3 µC and +3 µC are 6 cm apart. Point P lies 6 cm from the midpoint between them, on the perpendicular bisector. Find the magnitude of the electric field E at P. Use k = 8.99 × 10⁹ N·m²/C².

q₁ = +3 µCq₂ = +3 µCd = 6 cmh = 6 cm

E = N/C

Answer key

1. a = 2.814 × 10¹⁴ m/s²
2. F = 2.397 N
3. E = 1.423 × 10⁶ N/C
4. x = 55.05 cm
5. E = 4.317 × 10⁶ N/C
6. E = 1.072 × 10⁷ N/C

Full step-by-step solutions: practise this topic on examproblems.com.