Calculating Current for .75T Solenoid (4300 turns, 38cm long)

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Homework Help Overview

The problem involves calculating the current needed for a solenoid with specific dimensions and characteristics to achieve a desired magnetic field strength. The subject area is electromagnetism, specifically focusing on solenoids and magnetic fields.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to apply the equation for magnetic field strength but expresses uncertainty about the conversion of units and the application of the number of turns. Some participants clarify the definition of N as the number of turns per unit length and question how to calculate it based on the total number of turns and the length of the solenoid.

Discussion Status

The discussion is ongoing, with participants providing clarifications regarding the relationship between total turns and turns per unit length. There is an exploration of how to correctly apply the given information to the equation.

Contextual Notes

The original poster mentions difficulty finding additional equations in their textbook, indicating potential constraints in resources or understanding. The conversion of length from centimeters to meters is also noted as a point of confusion.

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Homework Statement


You want to make a solenoid that is 38 cm long with 4300 turns. How much current should you run through the solenoid to produce a magnetic field of .75 T?


Homework Equations


B = uoNI


The Attempt at a Solution


I converted 38 cm to m (not sure where to use this number). i used the above equation but got it wrong. I have looked all in my textbook and can't find any other equation to use. help!
 
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In the equation N is the number of turns per unit length.
 
so N x .38?
 
matt72lsu said:
so N x .38?
No. Nx0.38 = total number of turns.
N = 4300/0.38
 

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