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.

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1.Easy

Two point charges of +2 µC and +8 µC are 25 cm apart. Find the magnitude of the electric force F between them. Use k = 8.99 × 10⁹ N·m²/C².

q₁ = +2 µCq₂ = +8 µCr = 25 cm

F = N

2.Easy

Two point charges of +10 µC and +4 µC are 12 cm apart. Find the magnitude of the electric force F between them. Use k = 8.99 × 10⁹ N·m²/C².

q₁ = +10 µCq₂ = +4 µCr = 12 cm

F = N

3.Medium

Charges of +8 µC and +5 µC are 30 cm apart. At what distance x from the +8 µC charge, on the line between them, is the electric field zero?

q₁ = +8 µCq₂ = +5 µCd = 30 cm

x = cm

4.Medium

Two identical small metal spheres carry charges of −1 µC and −4 µC. They are touched together and then put back 40 cm apart. Find the magnitude of the force F between them now. Use k = 8.99 × 10⁹ N·m²/C².

q₁ = −1 µCq₂ = −4 µCr = 40 cm

F = N

5.Hard

Charges of +2 µC and +2 µC are 8 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 = +2 µCq₂ = +2 µCd = 8 cmh = 6 cm

E = N/C

6.Hard

Charges of +1 µC and +1 µC are 12 cm apart. Point P lies 5 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 = +1 µCq₂ = +1 µCd = 12 cmh = 5 cm

E = N/C

Answer key

1. F = 2.301 N
2. F = 24.97 N
3. x = 16.75 cm
4. F = 0.3512 N
5. E = 5.754 × 10⁶ N/C
6. E = 1.887 × 10⁶ N/C

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