- #31
hooman
- 22
- 0
i've already seen it but i don't understand. can you please explain it to me based on the question i asked above.MartinCarr said:
Magnetic forces on current-carrying wires
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Homework Help Overview
The discussion revolves around the magnetic forces acting on a current-carrying wire, specifically wire X, influenced by two other wires, Y and Z. Participants are exploring the relationships between the forces exerted by these wires and the resultant magnetic force on wire X.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants are attempting to clarify the direction and magnitude of the forces acting on wire X, questioning the meaning of terms like "pointing towards X." There is discussion about using the right-hand rule to determine force directions and whether to consider these directions as positive or negative in calculations.
Discussion Status
There is ongoing exploration of the forces acting on wire X, with participants raising questions about the contributions from wires Y and Z. Some have provided interpretations of the problem's wording, while others are seeking clarity on how to approach the calculations based on the given information.
Contextual Notes
Participants note confusion regarding the phrasing of the problem, particularly the direction of the resultant force on wire X. There is also mention of the assignment context, which may impose specific constraints on how the problem should be interpreted.
- #32
Doc Al
Mentor
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How about answering the question I posed earlier?
You are given the resultant F/L on wire X. You've calculated the contribution from wire Y. So, what must be the contribution from wire Z? That will tell you the direction of the current in Z and allow you to calculate the magnitude of that current.Doc Al said:
- #33
hooman
- 22
- 0
2.5x10^-4 . is it right?Doc Al said:
- #34
MartinCarr
- 10
- 1
Did you work this out or do you need me to explain more?
- #35
Doc Al
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Don't just give a numeric answer. Describe how you got your answer. And what does that tell you about the direction and magnitude of the current through Z?hooman said:
- #36
hooman
- 22
- 0
explain pleaseMartinCarr said:
- #37
hooman
- 22
- 0
from the question a, i need to know the direction whether it is right or wrong. so, fron the diagram itself we can know whether it is right or wrong. but i don't know how. i cannot determine the direction by using calculation because how can i know the equation have to use minus or addition.Doc Al said:
- #38
hooman
- 22
- 0
the statement is wrong. the right one is the resultant force per unit length is actually acted on Y not on X. it's a mistake in typing the question. sorry. so how to determine the direction whether it's right or wrong?MartinCarr said:
- #39
hooman
- 22
- 0
the statement is wrong. the right one is the resultant force per unit length is actually acted on Y not on X. it's a mistake in typing the question. sorry. so how to determine the direction whether it's right or wrong?Doc Al said:
- #40
Doc Al
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At least that explains the "towards X" statement.hooman said:
Do you know how to find the force/length between two current-carrying wires? Start there.hooman said:
Try this: Magnetic Force Between Wires
- #41
hooman
- 22
- 0
what does it means by pointing towards X? yes, I do know how to find F/lDoc Al said:
- #42
hooman
- 22
- 0
but, in the question in the link that you gave, i don't know how to do it because the question itself doesn't give any valueDoc Al said:
- #43
MartinCarr
- 10
- 1
As we know a current carrying wire will induce a magnetic field around it. This field will be clockwise around the wire in the direction of current. Both wire Y and Z will exert a force on X.
By looking at the direction of the magnetic field from Y and then Z at the side of X (either into or out of the paper) you can use the hand rules (movement, flux & current) you can work out which way the wire will move.
Using the formula in the attachment you can then calculate the force and hence the direction and value of current in the question.
By looking at the direction of the magnetic field from Y and then Z at the side of X (either into or out of the paper) you can use the hand rules (movement, flux & current) you can work out which way the wire will move.
Using the formula in the attachment you can then calculate the force and hence the direction and value of current in the question.
- #44
Neelima
- 5
- 1
Considering the figure as it is ,
Force on X due to Y is towards left
Force on X due to Z is towards right.
As net force on X is towards left ( see the attachment ).
F(y) > F (z).
F (net) = F(y) - F( z)
50 x 10^(-5) = 25 x 10^ (-5) - (20xI /6) x 10^(-5)
Solving we get negative value for I which is meaningless . In my opinion it should not be.
So direction of current in Z should be downward.
Then due to both Y and Z forces will be towards X.
Force on X due to Y is towards left
Force on X due to Z is towards right.
As net force on X is towards left ( see the attachment ).
F(y) > F (z).
F (net) = F(y) - F( z)
50 x 10^(-5) = 25 x 10^ (-5) - (20xI /6) x 10^(-5)
Solving we get negative value for I which is meaningless . In my opinion it should not be.
So direction of current in Z should be downward.
Then due to both Y and Z forces will be towards X.
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