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ecure https: llsession.masteringphysics.com/myct/itemview?assignmentProblemIDa73334053 ysics 204B (SPRING 2017) Signed in as Meshari Alsharari HM p l blem Set 12 Problem 1 Resources previous I 1 of 5 I ne roblem 1 Be 0.085 At one instant, the electric and magnetic fields at Submit My Answers Give Up one point of an electromagnetic wave are E (2001, 3303-60k)v/m and incorrect; Try Again Part C What is the Poynting vector at this time and position? Find the z-component Express your answer to two significant figures and include the appropriate units. Value Units Submit My Answers Give Up Part D Find the y-component. units. Express your answer to two significant figures and include the appropriate Value Units

Explanation / Answer

Given,

electric fieldE = (200i + 300j - 60k) V/m

Magnetic fieldB = B0*(7.8i -7.3j + ak )

B0 = 0.085 ut

(C)

The poynting vector is given by

P = ( 1/ u0)*( E*B )

= ( 1/ u0)*(B0)*( 200 i +300 j - 60k) cross multiplication (7.8i - 7.3j + ak)

= ( 1/ 4*phi*10^-7)*(0.087*10^-6)*[(300*a+450) i - (1332) j + (-800)]

= [(20.1*a+30.4) i - (90.04) j + (-54.08) k]

Therefore the x-component of the pointing vector is Sx = (20.1a+30.4) W/m^2
(Put the value a in the question)

(D)

Therefore the x-component of the pointing vector is Sy = 90.14 W/m^2   

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