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Name: _____________________________ Class: __________________ Date: __________________ Electromagnetic Induction Chapter Study Guide Teacher Notes and Answers 1. e 2. a. 0.50 s b. 0.26 m2 c. 2.6 V 3. a. magnetic field, conductor, relative motion b. answers may vary, but could include the following: water wheel, windmill, electric motor, combustion engine 4. a. 6.28 rad/s b. 7.1 102 m2 c. 110 V d. 78 V 5. A motor converts electric energy to rotational energy; generators converts rotational energy to electric energy. 6. a. increases b. induces current while change occurs c. It decreases magnetic field which will induce a current while the change occurs. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Physics 1 Study Guide Name: _____________________________ Class: __________________ Date: __________________ Electromagnetic Induction Chapter Study Guide 1. Which of the following actions will induce an emf in a conductor? a. Move a magnet near the conductor. b. Move the conductor near a magnet. c. Rotate the conductor in a magnetic field. d. Change the magnetic field strength. e. all of the above 2. A circular loop (10 turns) with a radius of 29 cm is in a magnetic field that oscillates uniformly between 0.95 T and 0.45 T with a period of 1.00 s. a. How much time is required for the field to change from 0.95 T to 0.45 T? _________________________________________________________________ b. What is the cross-sectional area of one turn of the loop? _________________________________________________________________ c. Assuming that the loop is perpendicular to the magnetic field, what is the induced emf in the loop? _________________________________________________________________ 3. Electric generators convert mechanical energy into electrical energy. a. What are the requirements for generating emf? _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ b. The mechanical energy input is usually rotational motion. What are two possible sources of rotational motion? _________________________________________________________________ _________________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Physics 2 Study Guide Name: _____________________________ Class: __________________ Date: __________________ Chapter Study Guide continued 4. A 250-turn generator with circular loops of radius 15 cm rotates at 60.0 rpm in a magnetic field with a strength of 1.00 T. a. What is the angular speed of the loops? _________________________________________________________________ b. What is the area of one loop? _________________________________________________________________ c. What is the maximum emf? _________________________________________________________________ d. What is the rms emf? _________________________________________________________________ 5. An electric motor is sometimes called a generator in reverse. Explain your understanding of this statement. _________________________________________________________________ _________________________________________________________________ 6. Consider a two-coil transformer joined by a common iron core. a. If the current in the primary side is increased, what happens to the magnetic field in the core? _________________________________________________________________ _________________________________________________________________ b. What effect does the answer to item 6a have on the secondary coil? _________________________________________________________________ _________________________________________________________________ c. Fully explain the effect of reducing the current to the primary side of a transformer. _________________________________________________________________ _________________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Physics 3 Study Guide