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Energy Stored in Magnetic Field of Solenoid 
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#1
Apr1609, 02:21 PM

P: 21

1. The problem statement, all variables and given/known data
The magnetic field inside an airfilled solenoid 39.9cm long and 2.00cm in diameter is 0.800T. Approximately how much energy is stored in this field? 2. Relevant equations U=(1/2)LI^2 => U = (1/2)(B^2)(area*length)/(u) 3. The attempt at a solution I discovered how to derive the bottom equation from the top equation from http://hyperphysics.phyastr.gsu.edu...indeng.html#c2 The derivation on the site seems to make sense, but when I try to use the bottom equation I get: U = (1/2)(0.8^2)(Pi*0.01^2)*(0.399)/(8.85*10^7) = 45.324 J What am I missing here? Thanks, x^2 


#2
Apr1709, 03:45 AM

Emeritus
Sci Advisor
PF Gold
P: 4,980

Check the value you use for permeability.



#3
Apr1709, 01:37 PM

P: 21

x^2 


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