Question

An electric slot car has a coil with 100 turns of wire. These loops have a current of 0.1 A and cover an area of 0.1 cm2. If the coil is placed in a uniform 1 T magnetic field such that the loop areas are perpendicular to the B-field, what torque will be felt by the coil?

Answer 1

The torque will be felt by the coil is zero

Step-by-step explanation:

The torque is:

`\tau =\mu B=\mu Bsin\theta`

Where

μ is the magnetic moment = N * I * A, where N is the number of turns, I is the current and A is the area

A = 0.1 cm² = 1x10⁻⁵m²

`\mu =100*0.1*1x10^(-5) =1x10^(-4) Am^(2)`

If the angle between the area and the magnetic field is 0 (are in parallel), then:

`\tau =1x10^(-4) *1*sin0=0Nm`