R1 350 Ohms: What Current Flows at 50V?

  • Thread starter Thread starter x^2
  • Start date Start date
  • Tags Tags
    Bridge Resistor
AI Thread Summary
The discussion revolves around calculating the current flowing through a 350 Ohm resistor (R1) when a 50V voltage is applied. Initially, there was confusion about whether the potential at R1 was equal, leading to the assumption that the current would be zero. However, it was clarified that with 50V applied, the voltage across R1 would indeed result in no net voltage, confirming that the current is zero. The participant planned to consult their professor regarding the initial misunderstanding. Ultimately, the correct conclusion is that the current through R1 is 0 A.
x^2
Messages
19
Reaction score
1

Homework Statement


What current flows through resistor R1 (350 Ohms) in the figure when the applied voltage is 50 V?
prob03a_circ_comp_resis.gif


Homework Equations



V = IR ?

The Attempt at a Solution



I would have thought the answer would be zero because I thought the potential at R1 is equal (but this was incorrect). What am I missing here? I guess I don't see how the potential at this point isn't equal, and I'm not sure how to solve it now knowing that it must not be the same.

x^2
 
Last edited:
Physics news on Phys.org
x^2 said:
I would have thought the answer would be zero because I thought the potential at R1 is equal (but this was incorrect). What am I missing here? I guess I don't see how the potential at this point isn't equal, and I'm not sure how to solve it now knowing that it must not be the same.

x^2

If the other R's are equal, then it is 0.

With 50V applied to AB, the terminals of each side of R1 would be 25V. No net voltage, no current.
 
LowlyPion said:
If the other R's are equal, then it is 0.

With 50V applied to AB, the terminals of each side of R1 would be 25V. No net voltage, no current.

That's what I thought... I tried 0 A but it was incorrect. I'm going to talk to the prof. and see what is wrong.

Thanks!
x^2
 
x^2 said:
That's what I thought... I tried 0 A but it was incorrect. I'm going to talk to the prof. and see what is wrong.

Thanks!
x^2

The correct answer is 0 A. There was a problem with the system which was why I was getting it wrong.

Thanks for the confirmation!
x^2
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top