Lewin's NCF Experiment and Lecture

[tinman]

If all is going as expected, you should measure essentially 0V between the wires when the measuring probes are in the horizontal plane. What should you measure between the wires when the measuring probes are in the vertical plane, i.e. decoupled from the experiment?

With the scope prob and ground wire forming a loop that is horizontal to the resistor loop,i get the same voltage reading as i do across the 100R.
With the scope probe and ground wire forming a loop that is vertical to that of the resistor loop,i get a much higher voltage potential.

And why the inverted voltage to that of the scope shot showing the scope probe position across the 100R in my second last post?.

Brad

[poynt99]

With the scope prob and ground wire forming a loop that is horizontal to the resistor loop,i get the same voltage reading as i do across the 100R.
With the scope probe and ground wire forming a loop that is vertical to that of the resistor loop,i get a much higher voltage potential.

And why the inverted voltage to that of the scope shot showing the scope probe position across the 100R in my second last post?.

Brad

It would appear something is not sufficient in your setup. You should not be measuring a voltage between the wires, or at least very little.

In regards to your question, I'm not sure what you are asking. Do you want to know why the 100 Ohm resistor shows a negative polarity while the 900 Ohm shows a positive polarity? Is that what you are asking?

[wattsup]

If we look at the moded diagram below,you can see i have placed both a blue line between the bottoms of the resistors,and a red line between the two tops of the resistors.
There should be no voltage drop(or a very extremely small amount)between the points of either the red line,or the blue line. This means that the voltage should be the same for both scope positions marked on the diagram.

I think the problem here lies within the measurement device leads them self-circled in red,where they set up there own loop that the electric field from the solenoid acts upon.
CH1,and CH2 should read the same.
Just my thoughts.

Brad

@tinman

I agree. The probe wires are just as prone to the influence of the solenoid since the ground reference that is supposed to shield the probe conductor is not separate from the scope's differential calculation of both ground and probe.

What if you put the scope on A-B math and only use the two probes across each resistor separately. Will you get the same results?

wattsup

[minnie]

  With words like moot and germane cropping up I had to reach for my
  dictionary.
    One thing is clear, everybody except for poynt and Koala just haven't
  got a clue.
     It's amazing how two resistors can baffle everyone.

[Johan_1955]

     It's amazing how two resistors can baffle everyone.

With this only 4 component circuit, you're also missing 2 pcs in counting?
From only 2 pages, you're also missing 2 posts?

Tells also a lot!

Regards, Johan