- #1
cukitas2001
- 63
- 0
Hello all,
Im trying to do this magnetic field lab and am having trouble with the very last question. It goes: "Assuming the equation (Ampere's Law: B=unI) applies for the solenoid, calculate the value and uncertainty of u (permeability of free space) using the graph of B vs. n.
In this part of the experiment we had a constant current through a slinky and measured the magnetic field as we changed the number of turns of the slinky.
I made my graph os B vs. n and it has a exponential looking relationship so i chose that as my trendline in Excel. Is this correct of should it have been a Power trendline? I chose exponential since it fits the data better.
The equation of my exponential trendline was y=18.473e^(15.161x)
so n is y and x is b and the rest of the garbage there is u and I. If i could only isolate the u and I...what i tried was multiplying both side by ln but i got stuck becasue i don't remember my log rules :-(. What i have right now is ln(n)=15.161x*2.91631. Am i on the right track? i also have the table of values and graph of this if it would help any.
Im trying to do this magnetic field lab and am having trouble with the very last question. It goes: "Assuming the equation (Ampere's Law: B=unI) applies for the solenoid, calculate the value and uncertainty of u (permeability of free space) using the graph of B vs. n.
In this part of the experiment we had a constant current through a slinky and measured the magnetic field as we changed the number of turns of the slinky.
I made my graph os B vs. n and it has a exponential looking relationship so i chose that as my trendline in Excel. Is this correct of should it have been a Power trendline? I chose exponential since it fits the data better.
The equation of my exponential trendline was y=18.473e^(15.161x)
so n is y and x is b and the rest of the garbage there is u and I. If i could only isolate the u and I...what i tried was multiplying both side by ln but i got stuck becasue i don't remember my log rules :-(. What i have right now is ln(n)=15.161x*2.91631. Am i on the right track? i also have the table of values and graph of this if it would help any.