# pe20f08 - Last updated PHY 2054 Discussion Fall 08 Practice...

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Last updated: October 22, 2008 PHY 2054 Discussion – Fall ‘08 Practice Exam Problems (Chapter 20) 1. A loop of area 0.250 m 2 is in a uniform 0.0200-T magnetic field. If the flux through the loop is 3.83 × 10 -3 Tm 2 , what angle does the normal to the plane of the loop make with the direction of the magnetic field? (Magnetic Flux) a. 40.0 ˚ b. 50.0 ˚ c. 37.5 ˚ d. This is not possible. 2. A planer loop consisting of four turns of wire, each of which encloses 200 cm 2 , is oriented perpendicularly to a magnetic field that increases uniformly in magnitude form 10 mT to 25 mT in a time of 5.0 ms. That is the resulting induced current in the coil if the resistance of the coil is 5.0 Ω ? (Induced Current) a. 60 mA b. 12 mA c. 0.24 mA d. 48 mA 3. A 10-turn square coil of area 0.036 m 2 and a 20-turn circular coil are both placed perpendicular to the same changing magnetic field. The voltage induced in each of the coils is the same. What is the area of the circular coil? (Faraday’s Law) a. 0.072 m 2 b. 0.60 m 2 c. 0.018 m 2 d. 0.036 m 2

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