Question

Calculate the force on a conductor 40cm long, with a current of 100A, at right angles to a magnetic field of flux density 0.25T. Sketch a diagram to indicate the direction of the force relative to the conductor and the magnetic field

Answer 1

The length of the conductor is L = 40 cm = 0.4 m

The current in the circuit is I = 100 A

The magnetic field of flux density is B = 0.25 T

The angle between them is 90 degrees.

The force will be

`\begin{gathered} F=\text{ILBsin 90} \\ =100*0.4*0.25 \\ =\text{ 10 N} \end{gathered}`

The direction can be calculated using Fleming's left-hand rule.

According to the rule, the index finger points to the direction of the magnetic field.

The middle finger points to the direction of the current.

The thumb indicates the direction of the force.

Such that all the three fingers are perpendicular to each other.

The figure can be drawn as