homework help > physics > physics q&a board > topic: brms and erms.please help.will rate lifesaver if answ...

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posted by  bonbons on 11/3/2009 4:27:08 PM  |  status: Closed  |  Earned Karma: 25

Brms and Erms.Please help.Will rate lifesaver if answer is correct.

Course Textbook Chapter Problem Needs by
Algebra Based Physics N/A N/A N/A 11/4/2009 at 1:00:00 PM
Question Details:
Find the rms (a) electric and (b)magnetic fields at a point 3.00 {\rm m} from a lightbulb that radiates 85.0 {\rm W} of light uniformly in all directions.


(I got 16.8 V/m for the ems which is correct, but I cannot figure out part B)My teacher wants the final answer to be in nT units
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posted by JamesD on 11/3/2009 4:37:37 PM  |  status: Live
Asker's Rating: Lifesaver   
Response Details:

  We know that  Erms and Brms  are related as

                                   Brms = Erms /c  = 16.8 V/m / 3*108 m/s  = 5.6*10-8  = 56*10-9 = 56nT
I hope this helps! Best of luck with the rest of your coursework.
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