The discussion revolves around finding the potential difference in a potentiometer circuit, specifically focusing on the relationship between different electromotive forces (E1 and E2) and the resistive properties of the circuit components.
Participants are actively engaging with the problem, clarifying assumptions about the connections in the circuit and the implications of known values. Some guidance has been provided regarding the relationship between E2 and the potential at point T, indicating a productive direction in the discussion.
There is confusion regarding the connections of E2 and the resistive lengths in the circuit, which are affecting participants' understanding of the potential differences involved. The discussion also highlights the importance of the galvanometer reading in determining potential at point T.
E1-E2?gneill said:
No. E2 is not connected to point T.Janiceleong26 said:
I'm confused .. Why isn't E2 connected to T?gneill said:
Because there's the lengths XT and TY of resistive wire between E2 and T. There is some (unknown) current running through those lengths, causing potential differences.Janiceleong26 said:
Okay.. So the p.d. across XT is XT/XY x E1?gneill said:
No. Forget about E1 for now; you don't have a value for it. What you are to assume is that you know E2, and that the galvanometer reading is zero.Janiceleong26 said:
Potential at T is equal to E2gneill said:
Right! Note that it doesn't matter what E1 is. As soon as the galvanometer shows zero current, the potential at point T must match E2.Janiceleong26 said:
Yeah! It's E2 divide by the length XT. Thanks !gneill said: