practicequiz8

# practicequiz8 - Name: _ Class: _ Date: _ ID: A...

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Name: ________________________ Class: ___________________ Date: __________ ID: A 1 Electromaganetic Induction Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. A metal bar moves at 2.5 m/s on two conducting parallel tracks 40 cm apart, as shown. The tracks have a negligible resistance and the bar has a resistance of 0.125 /cm. If there is a magnetic field of 0.50 T, the force necessary to keep the bar moving at 2.4 m/s is: a. 0.02 N b. 0.05 N c. 0.08 N d. 0.12 N e. None of the above ____ 2. The flux linkage through a coil is 50 mWb when 2.5 A current flows through it from a 6.0 V battery. How long after the coil was connected, will the flux be 25 mWb? a. 4.2 ms b. 5.8 ms c. 6.7 ms d. 8.4 ms e. None of the above ____ 3. The magnetic field through a single loop coil of cross-sectional area 44 cm 2 steadily changes from 6.3 mT to 8.8 mT in 0.5 s. The induced emf in the coil is: a. 22 µ V b. 28 V c. 35 V d. 43 V e. None of the above ____ 4. A 12 V battery is connected in series with a resistor and an inductor. The time constant of the circuit is 0.4 ms. If the maximum current in the circuit is 300 mA, the value of the inductance is: a. 6.4 mH b. 7.5 mH c. 16 mH d. 13 mH e. None of the above

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Name: ________________________ ID: A 2 ____ 5. A flat rectangular loop of wire, 6.0 cm x 8.0 cm, lies in a region where there is a uniform 0.5 T magnetic field in a direction at 30º with the plane of the loop. The magnetic flux through the loop is: a. 2.7 mWb b. 1.8 mWb c. 1.2 mWb d. 0.80 mWb e. None of the above ____ 6. A straight 40 cm long copper bar is moved at a constant speed of 1.2 m/s perpendicularly to a uniform 2.5 T magnetic field. The emf induced across the end of the bar is: a. 2.4 V b. 2.1 V c. 1.5 V d. 1.2 V e. None of the above ____ 7. A uniformly wound solenoid is changed by cutting it in at the middle to give two equal solenoids. . The self-inductance of each new solenoid is ________ times the value of the original solenoid. a. 1 b. 2 c. 1/2 d. 1/4 e. none of the above ____ 8. The north pole of a magnet moving toward one end of a solenoid connected to an ammeter produces a current flow. If the solenoid is turned around so that the magnet approaches the other end of the solenoid, the direction of the current flow though the ammeter will _______. a.
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## This note was uploaded on 01/24/2010 for the course PHYS 1 taught by Professor Onuich during the Spring '07 term at CSU Northridge.

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practicequiz8 - Name: _ Class: _ Date: _ ID: A...

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