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Earths Magnetic Flux

  • Thread starter muffintop
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  • #1
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1. At a certain location, the Earth's magnetic field has a magnitude of 5.6x10-5 T and points in a direction that is 72 degrees below the horizontal. FInd the magnitude of the magnetic flux through the top of a desk at this location that measures 110 cm by 57 cm.



2. I used the formula [tex]\Phi[/tex] = BA cos [tex]\theta[/tex]



The Attempt at a Solution


[tex]\Phi[/thex] = 5.6x10-5 x 1.10m x .57m x cos 72
=1.1e-5 Wb and it's wrong
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
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1. At a certain location, the Earth's magnetic field has a magnitude of 5.6x10-5 T and points in a direction that is 72 degrees below the horizontal. FInd the magnitude of the magnetic flux through the top of a desk at this location that measures 110 cm by 57 cm.

2. I used the formula [tex]\Phi[/tex] = BA cos [tex]\theta[/tex]

The Attempt at a Solution


[tex]\Phi[/thex] = 5.6x10-5 x 1.10m x .57m x cos 72
=1.1e-5 Wb and it's wrong
Welcome to PF.

Is the desk top a vertical surface or a horizontal one?

http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/fluxmg.html
 
  • #3
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Welcome to PF.

Is the desk top a vertical surface or a horizontal one?

http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/fluxmg.html

Horizontal. and since the I'm looking for the magnetic flux, it should be perpendicular to the area so I use sine instead of cosine. What a stupid mistake haha, thank you for your help!
 

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