Wiley PLUS Halliday, Fundamental s of Physics, 9e PHYSICS I, II, III (Physics 15

Question

Wiley PLUS Halliday, Fundamental s of Physics, 9e PHYSICS I, II, III (Physics 150 252) Read, Study&Practice; Assignment open Assignment Chapter 29, Problem 3 E At a certain location, Earth's magnetic field of 50 HT is horizontal and directed due north. Suppose the net field is zero exactly 11 cm above a long, straight, horizontal wire that carries a constant current. What is (a) the magnitude of the current (in A) and (b) the angle between the current direction and due north? mus (a) Number units Chhoter Problem 43 (b) Number Chtetet Click if you would like to Show Work for this question: QRto.Show.Mock By accessing this Question Assistance, you wil learn while you earn points based on the Point Potential Policy setby your instructor. Question Attempts: Unlimited SAve on Area SAEMITANSAERI 2000-2017 by John & Sons, Inc. or related companies. Al rights reserved.

Explanation / Answer

a) Earth's magnetic field H = 50 x 10-6 T

distance r = 11cm = 11 x 10-2 m

magnetic field at a distance r from the current carrying wire B = u0 i / 2 pi r

Net field B - H = 0

hence B = u0 i / 2 pi r = H

current i = H x 2 pi r/ u0  = H x 2 pi r/ ( 4 pi x 10-7 )

= 50 x 10-6 x11 x 10-2 / 2 x 10-7

= 27.5 A

b) To get null magnetic field at 11 cm current should flow in east direction

i.e angle is 900

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