Force on a Wire in a Magnetic Field Calculator
⚡ Electricity & magnetism. Use the Force on a wire in a magnetic field formula to find force, field strength b, current, length in the field: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Force | N |
| Field strength B | T |
| Current | A |
| Length in the field | m |
Worked example
Find the force when Field strength B = 0.5 T, Current = 3 A, Length in the field = 0.1 m.
Using F = BIL: Force = 0.15 N.
Frequently asked questions
What is the formula for Force on a wire in a magnetic field?
F = BIL.
What do the letters stand for, and what units are used?
Force in N, Field strength B in T, Current in A, Length in the field in m.
How do you calculate force?
Put the values into F = BIL. For example, with Field strength B = 0.5 T, Current = 3 A, Length in the field = 0.1 m, force = 0.15 N.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (force, field strength b, current, length in the field) and fill in the others: it rearranges the formula for you.
