Magnetic Force

  • Thread starter leolaw
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  • #1
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Ok, this problem shows up on my test today and I was wondering how you can solve it:

A circular coil of wire has a diameter of 20 cm and contains 10 loops, internal resistance of 8 ohms, and the coil is placed in a 2.00T external magnetic field. When 1 volt is applied to the coil, determine the maximum force exerted on the coil by the field.

First of all, I was thinking about using [tex]R = \rho \frac{l}{A}[/tex] and plug in the [tex] l [/tex] into [tex] F = IlB sin \theta [/tex]
But I wasnt given the [tex]\rho[/tex], so i try the torque formula:[tex]NIABsin\theta[/tex], but end up having Netwon * meter for the unit

How should i approach this problem?
 

Answers and Replies

  • #2
OlderDan
Science Advisor
Homework Helper
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leolaw said:
Ok, this problem shows up on my test today and I was wondering how you can solve it:

A circular coil of wire has a diameter of 20 cm and contains 10 loops, internal resistance of 8 ohms, and the coil is placed in a 2.00T external magnetic field. When 1 volt is applied to the coil, determine the maximum force exerted on the coil by the field.

First of all, I was thinking about using [tex]R = \rho \frac{l}{A}[/tex] and plug in the [tex] l [/tex] into [tex] F = IlB sin \theta [/tex]
But I wasnt given the [tex]\rho[/tex], so i try the torque formula:[tex]NIABsin\theta[/tex], but end up having Netwon * meter for the unit

How should i approach this problem?
The resistance of the wire is given as 8 ohms. The applied potential is 1 volt. The current is a simple calculation based on this information. After you get that, your appraoch to the magnetism aspects looks reasonable.
 
  • #3
85
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But how can i solve for [tex] l [/tex] in order to calculate the Force by using [tex]F = I l B sin \theta[/tex] ?
 

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