Consider two long, straight parallel wires, each carrying a current I. If the cu

Question

Consider two long, straight parallel wires, each carrying a current I. If the currents are flowing in opposite directions: the two wires will attract each other. the two wires will repel each other. the two wires will exert a torque on each other. neither wire will exert a force on the other. Two long parallel wires 20 cm apart carry currents of 5.0 A and 8.0 A in the same direction. Is there any point between the two wires where the magnetic field is zero? yes. midway between the wires yes, 12 cm from the 5-A wire yes. 7.7 cm from the 5-A wire no An incredible amount of electrical energy passes down the funnel of a large tornado every second. Measurements taken in Oklahoma at a distance of 9.00 km from a large tornado showed an almost constant magnetic field of 1.50 times 10-3 T associated with the tornado. What was the average current going down the funnel? (mu o = 4pi times 10-7 T-m/A) 450 A 675 A 950 A 1 500 A A high-voltage power line 20 m above the ground carries a current of 2 000 A. What is the magnetic field due to the current directly underneath the power line? ( mu 0 = 4 pi times 10-2 T-m/A) 20muT 35 mu T 14 mT 0.30 T The current in a long wire creates a magnetic field in the region around the wire. How is the strength of the field at distance r from the wire center related to the magnitude of the field? field directly proportional to r field inversely proportional to r field directly proportional to r2 field inversely proportional to r2 A uniform 4.5-T magnetic field passes perpendicularly through the plane of a wire loop 0.10 m2 in area. What flux passes through the loop? 5.0 T.m2 0.45 T.m2 0.25 T-m2 0.135 T-m2

Explanation / Answer

the answers are given serially according to the question 1. a,d 2. c 3. b 4. a 5. b 6. b

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