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Unformatted text preview: Solution for Homework 20 Displacement Current and EM Waves - Due Monday After Exam Solution to Homework Problem 20.1(Relation between Components of Light Wave) Problem: Select the answer below that best describes the relationship between the electric field, magnetic field, and the direction of propagation of electromagnetic radiation. Select One of the Following: (a) All parallel. (b) Electric parallel to the direction of propagation but perpendicular to magnetic field. (c) Electric and magnetic parallel but perpendicular to the direction of propagation. (d-Answer) All perpendicular. Solution All perpendicular. Total Points for Problem: 3 Points Solution to Homework Problem 20.2(Changing Earths Electric Field Problem) Problem: The Earths electrical field changes locally due to thunderstorm activity. Suppose the earths electric field changes from its normal value of 150 N C to zero in an hour following the function, E ( t ) = E e t/ where E = 150 N C and = 1 . 10 3 s . The earths field points radially downward. Compute the displacement current through a circular hoop of radius . 50m at t = 0 lying on the ground. Select One of the Following: (a) 1 . 3 10 12 A (b) 5 . 2 10 5 A (c-Answer) 1 . 10 12 A (d) The is no flow of charged particles in the earthe electric field so there is no displacement current.(d) The is no flow of charged particles in the earthe electric field so there is no displacement current....
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