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Straight Wire Magnetic Force, Current & Angle

Calculate force magnitude on a straight wire segment in a uniform magnetic field, including parallel zero-force cases.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

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A 3 m wire carrying 2 A perpendicular to a 0.5 T field experiences 3 N of force.

F = I L B sin θ

Enter these known values and leave the other values blank.

Current, field and force are magnitudes; length is the straight segment inside the uniform field. Included angle ranges from 0° to 180°.
Parallel and antiparallel alignment produce zero force. The vector direction follows the cross product I L × B.
An inverse angle from sine returns a principal solution; θ and 180° − θ have the same force magnitude.
Zero current or field gives zero force and makes some inverse problems nonunique. This model excludes field gradients and curved-wire integration.

Current, field and force are magnitudes; length is the straight segment inside the uniform field. Included angle ranges from 0° to 180°.

Bookify accepts zero field, current and force magnitudes and restricts the included angle to 0° through 180°.