7. Assume that emf is induced at the terminals of a solenoid Encircle what you t

Question

7. Assume that emf is induced at the terminals of a solenoid Encircle what you think is true: a) The induced emf functions as a voltage source and is measured in Volts b) The induced emf functions as a current source and is measured in Amperes c) The induced emf has nothing to do with voltage and current. d) None of the above. located in a changing magnetic flux 8. Assume that emf is induced in a closed ring of wire located in a changing magnetic flux Encircle what you think is true: a) The induced emf produces a current in the closed ring of wire because the ring is a closed circuit for current. b) The induced emf does not produce a current in the ring. c) None of the above. 9. Assume that emf is induced in a wire located in a changing magnetic flux. The wire does not make a closed loop Encircle what you think is true: a) The induced emf produces a current in the wire because the wire is a conductor b) The induced emf does not produce a current in the wire because the wire is c) None of the above. not a closed circuit for current 10. Assume that emf is induced in a closed ring made of glass located in a changing magnetic flux. Encircle what you think is true: a) The induced emf produces a current in the ring of glass because the ring makes a closed circuit for current b) The induced emf does not produce a current in the ring of glass because glass is not a conductor for current. c) None of the above. 11. Encircle what you think is true: a) Transformers are used to increase ac voltage. b) Transformers are used to decrease ac voltage. c) Transformers are used to increase ac current. d) Transformers are used to decrease ac current. e) Transformers are used only with ac current. f) Transformers are used with de current. g) None of the above.

Explanation / Answer

7) a) an induced emf functions as voltage source because the solenoid is not a closed loop so no current will flow.

8) a) an induced emf produces a current in the closed ring because the ring is a closed circuit of current

9) b) The induced emf does not create a current in the wire because the wire is not closed circuit

10) b) the induced emf does not produce a current because glass is a bad conductor of electricity

11) a,b,c,d,e transformer cannot be used with DC current because there is no changing current in DC

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