# Magnetic torque experiment

• quietrain
In summary, the experiment outlined in the provided website aims to measure torque as a function of the strength of magnetic field, the angle between the magnetic field and the magnetic moment, and the strength of the magnetic moment. To do so, the current in the helmholtz current coil will be varied to produce different strengths of constant magnetic fields, the conductor will be suspended in air to vary the angle, and the magnetic moment will be varied by adjusting the current in the coil. The torque will be measured using a Torsion dynamometer, which is a device that directly measures torque and is shown in the provided picture.

## Homework Statement

http://www.nikhef.nl/~h73/kn1c/praktikum/phywe/LEP/Experim/4_3_04.pdf

bascially it wants me to measure torque as a function of
1) strength of magnetic field between 2 helmholtz current coil (constant b-field)
2) angle between the magnetic field and the magnetic moment
3) strength of the magnetic moment

## The Attempt at a Solution

can anyone enlighten me what the experiment wants me to find exactly?

it seems to be asking me to measure torque, but how do i measure torque?

torque = magnetic moment X mag field = uBsin(Theta)
so since the B-field is constant between the helmholtz current coil,

for 1) i am suppose to vary the current in the coil to produce different strength of constant B-field right?
2) since the conductor is suspended in air, how am i suppose to hold it still to vary the angle? since the b-field of the helmholtz loops are always the same.
3)since B-field is cconstant, i can only vary mag moment, so u = current x area of coil, so since area of coil is constant, i can vary current only

Last but most important, how am i suppose to measure the TORQUE physically? the picture kind of shows a measuring rotating stuff on top but i have no idea what it means?

can torque be measured physically? thanks

Last edited:
The experiment apparatus has a Torsion dynamometer, 0.01 N listed. It is the device above the coils. It measures torque directly. Google "torsion Dynamometer" and the manufacturer name and you can see a close up of the device and download the manual if you like.

thank you very much!