Basic Coil Turn question please see

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Homework Help Overview

The problem involves a 200-turn coil made of copper wire with a specified length and diameter, and it seeks to determine the rate at which the magnetic field should increase to induce a current of 2.0 A in the coil. The magnetic field is stated to be perpendicular to the coil.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants express difficulty in understanding the problem and suggest starting with relevant equations. There is mention of the relationship between induced emf and the rate of change of the magnetic field. Questions arise regarding the completeness of the problem statement, particularly concerning missing information like the radius or cross-sectional area of the coil.

Discussion Status

Some participants are questioning the clarity of the problem statement and whether all necessary information has been provided. There is a recognition of the complexity of the topic, and while attempts to clarify the problem are made, no consensus or clear direction has emerged yet.

Contextual Notes

Participants note that the phrasing of the problem regarding the magnetic field's orientation may lead to different interpretations, which could affect the understanding of how to approach the problem. There is also acknowledgment that no additional information has been provided to clarify the situation.

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Homework Statement


200-turn,coil of 8.0cm length is made of 0.50mm-diameter copper wire.
Magnetic field is perpendicular to coil. At what rate B should increase to induce a 2.0 A current in the coil?

Homework Equations





The Attempt at a Solution


i am not getting anthing
 
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helpphysics said:
i am not getting anthing

Hello helpphysics,

Why don't start by stating any relevant equations, and then describe where and how you are getting stuck (showing your work as you go).
 
i am sorry i am not getting it
i just know that emf = A*∂B/∂t & thus
2R = A*∂B/∂t
 
Hello helpphysics,

I've been thinking about this problem a lot, and a couple of things are troubling me.

Is this a homework problem?

Is there anything missing in the problem statement, such as the radius, diameter, or cross sectional area of the coil? I see that the length is given. The length is useful if the coil is producing a magnetic field, but typically when discussing induced emf, something relating to the cross sectional area is given.

Are there any other coils or solenoids involved in this problem?

The problem statement says, "Magnetic field is perpendicular to coil." Initially I took this to mean that the cross sectional plane of the coil was perpendicular to the magnetic field (meaning the normal vector of the cross sectional area is parallel to the field). But thinking about it more, I think most people might interpret the problem statement as saying the major axis of the coil is perpendicular to the magnetic field. But if that was the case, there would be no induced emf at all! All I'm saying is that "Magnetic field is perpendicular to coil" is kind of a weird way to state the problem.

The more I look at this problem, the more it seems that maybe something is missing. :confused:
 
Last edited:
Sorry mate. No more info has been given.
Don't worry you are not the only one going nuts over this. Physics is a hard nut! :-p
 
Anyway can you please help me out with the following?

240V , 50 Hz electrical appliance is rated at 2 kW. It has a lagging power factor of 0.7
(a) What is appliances power factor when it is used on a 60Hz supply.
(b) What is supply voltage required to maintain appliance at its rated power when operated off a 60 Hz supply?

Please look into this.
Thanks
 

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