To investigate a factor affecting the magnetic field strength of a magnet

[kandyfloss]

1. As mentioned in the title,we were asked to investigate a factor that affects the magnetic strength of a solenoid.
Independant variable is current.I used a solenoid , put it on a stand vertically,above of a magnet placed on a digitall weighing machine.I set the solenoid,a device to measure current,voltmeter in series in a circuit.I started off with one volt,and increased the voltage gradually and noted the readings on the weiging machine.


Can't figure out the equation.



3. i found that as the current increases the weight of the magnet increases..so which is it ,in this case which affects the magnetic field strength of the solenoid?i'm a bit confused.i've attached a xls file of the readings i've..PLEASE HELP!

 

[jbsteele]

The equation that describes the relationship between current and magnetic field strength is: Magnetic Field Strength = (μ * N * I) / (l), where μ is the magnetic permeability of the material, N is the number of turns of wire in the solenoid, I is the current in the solenoid and l is the length of the solenoid. Thus, as the current increases, the magnetic field strength of the solenoid will also increase.