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# F = BIL

### F = BIL

We can calculate the force experienced by a current-carrying conductor in a magnetic field by using the equation Force = Magnetic Flux Density x Current x Length.

What do you think is another term for the strength of the magnetic field?

**Flux** describes the rate of flow of something. **Magnetic flux density** is the total number of magnetic field lines passing through a specified area in a magnetic field. This is measured in **Tesla (T).**

Pick all the options that affect the size of a force that acts on a current-carrying conductor in a magnetic field.

You can select multiple answers

The force acting on a conductor in a magnetic field depends on three things: the **magnetic flux density**, the size of the **current** flowing through the conductor, and the **length** of the conductor.

What is the correct unit for measuring **current** through a conductor in a magnetic field?

Which of the following would be the best unit for measuring the **length** of the conductor?

An iron bar of length **0.1 m** is connected to an electrical circuit with a current of **2 amps** and placed perpendicular to a magnetic field of **0.2 T**. What do you think is the most reasonable option for the force acting on the iron bar?

An iron bar of length **0.1 m** connected to a circuit with a current of **2 A** and placed perpendicular to a magnetic field of **0.2 T**, produces a force of **0.04 Newtons**.

What is the correct formula for calculating the force acting on a conductor in a magnetic field? $F$ is force, $L$ is length, $I$ is current and $B$ is the magnetic flux density.

When the current acting through a conductor in a magnetic field is at **90 degrees** to the magnetic field, we can calculate the force acting on a conductor using the formula $F=BIL$.

$F$ is the force in Newtons (N), $B$ is the magnetic flux density in Tesla (T), $I$ is current through the conductor in amps (A), and $L$ is length of the conductor is metres (m).

An iron bar of length **0.5 m** is connected to an electrical circuit with a current of **2 A** and placed perpendicular to a magnetic field of **0.5 T**. Calculate the force acting on the iron bar.