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Unformatted text preview: yoon (jey283) – Ch18-h3 – turner – (56545) 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A straight wire of length 0 . 62 m carries a conventional current of 0 . 9 A. What is the magnitude of the magnetic field made by the current at a location that is a perpendicular distance 3 cm from the center of the wire? Taking μ 4 π = 1 × 10 − 7 T · m / A , first use the approximate formula to find the field. Answer in units of T 002 (part 2 of 2) 10.0 points Now use the exact formula. Answer in units of T 003 (part 1 of 2) 10.0 points When you bring a current-carrying wire down onto the top of a compass, aligned with the original direction of the needle and 6 mm above the needle, the needle deflects by 13 degrees, as in the figure below. 13 ◦ B Earth Wire Assuming the compass needle was origi- nally pointing toward the north, what direc- tion is the conventional current traveling in the wire, and what is the direction of the force on the compass needle due to the mag- netic field caused by the current in the wire? 1. North, West 2. North, East 3. South, West 4. South, East 004 (part 2 of 2) 10.0 points Calculate the amount of current flowing in the wire. The measurement was made at a location where the horizontal component of the Earth’s magnetic field is B Earth = 2 × 10 − 5 T . Use μ 4 π = 1 × 10 − 7 A . 005 (part 1 of 2) 10.0 points In the figure below, a long current-carrying wire, oriented north-south, lies on a table (it is connected to batteries that are not shown)....
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This note was uploaded on 10/19/2011 for the course PHY 56545 taught by Professor Turner,j during the Fall '11 term at University of Texas.
- Fall '11