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Unformatted text preview: marout (ssm979) – ohw18 – turner – (56725) 1 This printout should have 15 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A closed circuit consists of two semicircles of radii 44 cm and 23 cm that are connected by straight segments, as shown in the figure. A current of I = 4 A flows around this circuit in the clockwise direction. The permeability of free space is 4 π × 10 − 7 T m / A. O 2 3 c m 4 4 c m ˆ k ˆ ı ˆ ˆ is upward from the paper I = 4 A I What is the direction of the magnetic field B at point O . 1. vector B bardbl vector B bardbl = +ˆ ı 2. vector B bardbl vector B bardbl = + ˆ k 3. vector B bardbl vector B bardbl = − ˆ k 4. vector B bardbl vector B bardbl = +ˆ 5. vector B bardbl vector B bardbl = − ˆ ı 6. vector B bardbl vector B bardbl = − ˆ 7. None of these are true‘. 002 (part 2 of 2) 10.0 points Find the magnitude of the magnetic field at point at point O . Answer in units of μ T. 003 10.0 points The closed loop shown in the figure carries a current of 8 A in the counterclockwise direc tion. The radius of the outer arc is 60 cm , that of the inner arc is 40 cm . Both arcs ex tent an angle of 60 ◦ . The permeability of free space is 4 π × 10 − 7 T m / A. 4 c m C B 6 c m D A O 60 ◦ y z Find the component of the magnetic field at point O along the x axis. Answer in units of T . 004 10.0 points Given: Three conductors (same length) have the shape of an equilateral triangle (whose sides are of length ℓ 3 ), a ring (whose radius is of length r ), a square (whose sides are of length ℓ 4 ). These conductors’ lengths are all equal (perimeters are 3 ℓ 3 = 2 π r = 4 ℓ 4 ). All conductors carry the same clockwise current I as shown in the figure below....
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 Fall '10
 TURNER,J
 Cartesian Coordinate System, René Descartes, Magnetic Field

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