Physics · University
Magnetic force magnitude
The stated velocity is perpendicular to the magnetic field. Magnetic force does no work on the point charge.
Method and conditions
The stated velocity is perpendicular to the magnetic field. Magnetic force does no work on the point charge.
F = |q|vB sin θ
Worked examples
A charge of magnitude 7 μC travels at 13 m/s perpendicular to B=1.8 T. Find magnetic force magnitude in μN. Round the final result to 4 decimal places if needed. Answer in μN.
At 90°, sin θ=1. The micro prefix in charge and requested force cancel numerically.
163.8 μN
A charge of magnitude 5 μC travels at 17 m/s perpendicular to B=3 T. Find magnetic force magnitude in μN. Round the final result to 4 decimal places if needed. Answer in μN.
At 90°, sin θ=1. The micro prefix in charge and requested force cancel numerically.
255 μN
Try it
A charge of magnitude 11 μC travels at 3 m/s perpendicular to B=2.5 T. Find magnetic force magnitude in μN. Round the final result to 4 decimal places if needed. Answer in μN.
A charge of magnitude 16 μC travels at 21 m/s perpendicular to B=1.5 T. Find magnetic force magnitude in μN. Round the final result to 4 decimal places if needed. Answer in μN.
Check your work
Answers and marking notes
- 82.5 μN
At 90°, sin θ=1. The micro prefix in charge and requested force cancel numerically.
- 504 μN
At 90°, sin θ=1. The micro prefix in charge and requested force cancel numerically.
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
AI-assisted preview; independent educational review required. Level labels describe prerequisites, not accreditation or official curriculum alignment.