BIL Coil

Turn electromagnetic force into real, measurable data

The BIL Coil is a classroom apparatus designed to measure the force on a current-carrying conductor in a magnetic field. It enables direct investigation of the relationship between magnetic field strength, current, and conductor length through the equation F = BIL.

Designed for quick setup and reliable use, the BIL Coil requires only a single ring stand for suspension within a magnetic field. Selectable tappings for one, five, or ten wire lengths make it easy to vary and amplify the force, producing measurable results even with low-resolution balances. This flexibility allows students to collect clear, repeatable data while exploring how each variable affects force.

Why Teachers Love the BIL Coil

• Clear demonstration of the motor effect: Makes force on a current-carrying wire visible and measurable

• Adjustable force output: Multiple wire-length options (1, 5, 10) increase measurable force

• Simple setup: Works with a standard ring stand and magnetic field source

• Reliable data collection: Produces consistent results across a wide range of classroom equipment

• Durable classroom design: Built for repeated student use