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# HW21 - Platt David Homework 21 Due 4:00 am Inst Ken Shih...

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Platt, David – Homework 21 – Due: Oct 28 2005, 4:00 am – Inst: Ken Shih 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 2) 10 points Given: B = b t , where b = 0 . 9 T / s (lower figure). Consider a changing magnetic field (from B 0 to B , upper figure) within a circle of radius 4 m. The magnetic field is pointing into the page and its magnitude is increasing. 4 m B 0 B 0 B 0 4 m B B B ~ t ~ B 0 B 0 B Find the direction of the induced emf E ind . 1. clockwise 2. counter-clockwise 3. out of the page 4. into the page 002 (part 2 of 2) 10 points Find the magnitude of the induced electric field E ind on the perimeter of the circular magnetic field. Answer in units of V / m. 003 (part 1 of 1) 10 points A rectangular loop of wire is pulled through a magnetic field B (out of the page). Shown below are four different stages of development of this procedure, labeled A , B , C , and D .

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HW21 - Platt David Homework 21 Due 4:00 am Inst Ken Shih...

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