A straight wire is aligned east-west in a region where Earth's magnetic field has magnitude 0.48 mT

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A straight wire is aligned east-west in a region where Earth's magnetic field has magnitude 0.48 mT and direction 72° below the horizontal, with the horizontal component directed due north. The wire carries a current I toward the west. The magnetic force on the wire per unit length of wire has magnitude 0.020 N/m.
(a) What is the direction of the magnetic force on the wire?
(b) What is the current I?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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