1) when there is a readjust in the magnetic field in a close up door loop of wire A) a voltage is induced in the wire. B) a current is developed in the loop the wire. C) electromagnetic induction occurs. D) all of these. E) none of these.

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C

2) Thrust a magnet into a coil of wire and the coil A) becomes an electromagnet. B) has actually a current in it. C) both the these. D) neither of these.

B

3) when a magnet is thrust right into a coil of wire, the coil often tends to A) lure the magnet together it enters. B) defeat the magnet as it enters. C) both of these. D) neither of these.

B

4) Electromagnetic induction wake up in a coil when there is a readjust in A) electric field soot in the coil. B) magnetic ar intensity in the coil. C) voltage in the coil. D) the coil’s polarity. E) electromagnetic polarity.

D

5) Voltage can be induced in a cable by A) moving the wire near a magnet. B) relocating a magnet close to the wire. C) changing the current in a surrounding wire. D) all of these. E) no one of these.

E

6) A wire moving sidewise in a magnetic field has NO induced voltage if A) the is moving in the direction of the field.. B) that is relocating opposite the direction the the field. C) that is make of copper. D) that is moving very fast. E) 2 of these.

D

7) The magnetic field strength within a current-carrying coil will be higher if the coil encloses a A) vacuum. B) wooden rod. C) glass rod. D) stick of iron. E) none of these.

C

8) If a magnet is pushed right into a coil, voltage is induced across the coil. If the same magnet is pushed right into a coil v twice the variety of loops, A) one fifty percent as lot voltage is induced. B) the very same voltage is induced. C) double as lot voltage is induced. D) 4 times as much voltage is induced. E) none of these.

A

9) An electrical motor and electric generator are A) very comparable devices. B) entirely different devices.

B

10) A an equipment that transforms electrical energy to mechanical energy is a A) generator. B) motor. C) transformer. D) magnet. E) nobody of these.

A

11) A maker that transforms mechanical power into electric energy is a A) generator. B) motor. C) transformer. D) magnet. E) no one of these.

B

12) If the voltage produced by a generator alternates, it does so since A) unlike a battery, the produces alternate current. B) the an altering magnetic ar that produces the alternates. C) alterations in the mechanical power input. D) in impact it is an ac engine in reverse. E) the present it to produce alternates.

C

13) A rule difference in between an MHD generator and a standard generator is that the MHD generator A) has no moving parts. B) operates much more efficiently in ~ high temperatures. C) both that these. D) neither of these.

A

14) A transformer in reality transforms A) voltage. B) magnetic field lines. C) generators into motors. D) non-safe creates of power to safe forms of energy. E) every one of these.

C

15) The primary of a transformer is the coil associated to A) the load. B) the Internet. C) the strength line. D) nobody of these.

C

16) Transformers usage ac for this reason there will be the forced A) deliver of power from coil come coil. B) voltage because that transformation. C) change in magnetic ar for operation. D) change in intake current. E) magnetic field intensities.

E

17) compared to the primary voltage, the an additional voltage may be A) larger. B) smaller. C) the same. D) the same or smaller, but not larger. E) larger, smaller, or the same.

B

18) The output power of a transformer is A) better than the input power. B) same to the intake power. C) smaller sized than the input power. D) …may be any of these.

A

19) Disconnect a small-voltage battery native a coil of plenty of loops of wire and also a huge voltage is created by A) the huge collapse in the magnetic field. B) latent energy in the battery. C) the resistance of the battery to a readjust in polarity. D) electrons already in the wire. E) the electrical field in between the battery terminals.

B

20) power is transmitted at high voltages since the matching current in the wires is A) likewise high to provide appreciable strength to distant places. B) short so the overheating of the wires is minimized. C) both the these. D) no of these.

A

21) electrical power deserve to be sent indigenous one place to another without the require for connecting wires in between. This explain is A) true. B) false.

C

22) Rapid adjust of a magnetic ar induces A) a magnetic ar of greater magnitude. B) a magnetic ar of the exact same magnitude. C) an electrical field.

B

23) The metal detectors that human being walk with at airports run via A) Ohm’s law. B) Faraday’s law. C) Coulomb’s law. D) Newton’s laws. E) civil laws.

D

24) A step-up transformer boosts A) power. B) energy. C) both that these. D) no of these.

C

25) A step-up transformer has actually a ratio of one to ten. Neglecting slight losses, if 100 W of power get in the main coil, the power coming indigenous the second coil is A) 1 W. B) 10 W. C) 100 W. D) 1000 W. E) nobody of these.

B

26) A particular transformer doubles intake voltage. If the main coil has actually 10 A that current, then the present in the secondary coil is A) 2 A. B) 5 A. C) 10 A. D) 25 A. E) none of these.

C

27) steel detectors, prefer the ones supplied at airports, room activated by A) electrical fields. B) magnetic fields. C) electromagnetic induction. D) alternative current.

C

28) The principal advantage of ac power over dc strength is that A) less energy is dissipated during transmission. B) ac voltage oscillates when dc voltage walk not. C) ac voltage can be reinvented via traditional transformers. D) ac circuits multiply power an ext easily. E) ac circuits space safer.

E

29) The significant advantage that MHD generators over standard generators is that MHD generators A) execute not use electromagnetic induction. B) execute not call for magnets. C) require no strength input. D) all of these. E) nobody of these.

A

30) Neon indications require around 12,000 volts to operate. If the circuit provides a 120-volt strength source, the proportion of primary to second turns on the transformer need to be A) 1:100. B) 100:1. C) neither of these.

B

31) The voltage across the entry terminals the a transformer is 110 V. The primary has 50 loops and also the second has 25 loops. The voltage the transformer puts out is A) 25 V. B) 55 V. C) 110 V. D) 220 V. E) no one of these.

C

32) four amperes of current exist in the primary coil that a transformer. The voltage throughout the major coil is 110 V. What is the power output that the secondary coil? A) 27.5 W B) 110 W C) 440 W D) 880 W E) not enough information come say

C

33) Disregarding the results of friction, a cyclist will shore farther as soon as a lamp powered by a wheel generator is A) of short wattage. B) of high wattage. C) burned out. D) none of these.

B

34) together a engine armature turns faster and faster, net existing in the motor windings A) increases. B) decreases. C) remains unchanged.

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D

35) If the major of a transformer were connected to a dc power source, the transformer would have a voltage calculation A) in ~ a higher efficiency than with an ac source. B) the same. C) that is additionally dc. D) just while being associated or disconnected. E) nobody of these.