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white (rw22679) – Hw05 – Ross – (10219) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points An open hemispherical surface of radius 0 . 1043 m is in a magnetic field of 0 . 1853 T. The circular cross-section of the surface is perpendicular to the direction of the field. Calculate the magnetic flux through the surface. Correct answer: 0 . 00633277 T m 2 . Explanation: Let : B = 0 . 1853 T and r = 0 . 1043 m . Φ = B A = B π r 2 = (0 . 1853 T) π (0 . 1043 m) 2 = 0 . 00633277 T m 2 002 10.0 points A circular coil of wire rests on your desk. A magnetic field is directed at right angles to the plane of your desk and passes through the coil. For a clockwise current (as you look down on your desk) to be generated, the magnetic field must be directed 1. downward toward the desk and be in- creasing in time. 2. downward toward the desk and be con- stant in time. 3. upward away from the desk and be con- stant in time. 4. upward away from the desk and be in- creasing in time. correct Explanation: If an induced emf sets up a complete cur- rent, the direction of the induced current is always such as to oppose the change in mag- netic flux that produces it. 003 (part 1 of 2) 10.0 points A circular coil of wire 4 . 91 cm in diameter has a resistance of 2 . 63 Ω. It is located in a magnetic field of 0 . 399 T directed at right angles to the plane of the coil. The coil is removed from the field in 0 . 281 s. What is the induced emf in the coil? As- sume the magnetic flux is reduced linearly.
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  • Spring '10
  • Rhoads
  • Physics, Magnetic Field

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