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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. (dAnswer) All perpendicular. Solution All perpendicular. Total Points for Problem: 3 Points Solution to Homework Problem 20.2(Changing Earth’s Electric Field Problem) Problem: The Earth’s electrical field changes locally due to thunderstorm activity. Suppose the earth’s electric field changes from its normal value of 150 N C to zero in an hour following the function, E ( t ) = E e − t/τ where E = 150 N C and τ = 1 . × 10 3 s . The earth’s 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 (cAnswer) 1 . × 10 − 12 A (d) The is no flow of charged particles in the earth’e electric field so there is no displacement current.(d) The is no flow of charged particles in the earth’e electric field so there is no displacement current....
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This homework help was uploaded on 04/19/2008 for the course PHYS 2074 taught by Professor Stewart during the Spring '08 term at Arkansas.
 Spring '08
 Stewart
 Physics, Current, Work, Light

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