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# ch22 - chapter L 1 E LECTROMAGNETIC INDUCTION The figure...

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chapter ELECTROMAGNETIC INDUCTION L 1. The figure shows a uniform magnetic field that is normal to the plane of a conducting loop, which has a resistance R. Which one of the following changes will cause an induced current to flow through the resistor? (a) decreasing the area of the loop (b) decreasing the magnitude of the magnetic field (c) increasing the magnitude of the magnetic field (d) rotating the loop through 90° about an axis in the plane of the paper (e) all of the above . 3. A circular copper loop is placed perpendicular to a uniform magnetic field of 0.50 T. Due to external forces, the area of the loop decreases at a rate of 1.26 × 10 –3 m 2 /s. Determine the induced emf in the loop. (a) 3.1 × 10 –4 V (c) 1.2 × 10 –3 V (e) 3.1 V (b) 6.3 × 10 –4 V (d) 7.9 × 10 –3 V 4. A conducting loop has an area of 0.065 m 2 and is positioned such that a uniform magnetic field is perpendicular to the plane of the loop. When the magnitude of the magnetic field decreases to 0.30 T in 0.087 s, the average induced emf in the loop is 1.2 V. What is the initial value of the magnetic field? (a)

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ch22 - chapter L 1 E LECTROMAGNETIC INDUCTION The figure...

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