A. Tiny pieces of iron. B. Tiny domain names of aligned atoms. C. Ferromagnetic materials. D. Moving electrical charge. E. No one of these.

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2. Magnetic compasses supposedly were first used by

A. Columbus. B. Greeks. C. Australian aborigines. D. Vikings. E. pigeons, climate Chinese.

3. Moving electrical charges will interact with

A. An electrical field. B. A magnetic field. C. Both that these. D. No one of these.

Reasoning: Moving electrical charges will certainly be acted ~ above by a force because of both electric and magnetic fields.

4. If a secure magnetic field exerts a pressure on a relocating charge, that pressure is directed

A. The contrary the motion. B. In the direction that the motion. C. At right angles come the direction that the motion.

5.A transformer can be offered to rise the

A. voltage that AC electricity B. Power of AC electricity C. Voltage that DC power D. Power of DC electricity

Reasoning: Transformers cannot adjust the voltage the a DC (like a battery) source. Lock cannot adjust the strength either.

6. An stole rod becomes magnetic when

A. Optimistic ions accumulate at one finish and an unfavorable ions at the other end. B. That atoms room aligned having plus dues on one side and negative charges ~ above the other. C. the magneic dipoles room in the same direction. D. Its electron stop relocating and allude in the exact same direction. E. No one of these.

Reasoning: See page 464 of your text.

7. Prefer kinds that magnetic poles repel while unlike type of magnetic poles

A. Attract. B. Defeat also. C. May lure or repel.

8. Several document clips dangle from the phibìc pole that a magnet. The induced pole in the bottom of the lowermost record clip is a

A. Phibìc pole. B. South pole. C. Phibìc or south pole - no difference really.

9. An iron nail is much more strongly attracted to the

A. Phibìc pole that a magnet. B. South pole of a magnet. C. north or southern pole - no difference really.

10. Surrounding every moving electron is

A. A magnetic field. B. An electrical field. C. both of these. D. No one of these.

11. Magnetism is as result of the activity of electrons together they

A. Move roughly the nucleus. B. Spin on your axes. C. both the these. D. None of these.

12. Magnetic domains normally happen in

A. iron. B. Copper. C. Silver. D. All of these. E. No one of these.

Reasoning: Copper and also silver are NOT magnetic.

13. Magnetic field lines around a current-carrying wire

A. Prolong radially indigenous the wire. B. Circle the cable in close up door loops. C. Both of these. D. No of these.

Reasoning: See page 465, number 24.9.

14. The pressure on an electron relocating in a magnetic ar will it is in the largest when its direction is

A. The exact same as the magnetic field direction. B. Precisely opposite come the magnetic field direction. C. perpendicular to the magnetic field direction. D. In ~ an angle various other than 90 degrees to the magnetic ar direction. E. No one of these.

15. The intensity of cosmic beam bombarding the Earth"s surface is largest at the

A. poles. B. Mid-latitudes. C. Equator.

Reasoning: an ext particles are enetering the setting near the poles.

16. If we think that the planet as a magnet, its north (-seeking) pole is nearest

A. The Hudson Bay an ar of Canada. B. Australia. C. Both of these.

17. Which pole that a compass needle points to a southern pole the a magnet?

A. North pole B. South pole C. Both of these

18. Neon indications require around 12,000 volts to operate. If the circuit offers a 120-volt strength source, the ratio of major to secondary turns ~ above the transformer should be

A. 1:100. B. 100:1. C. Neither of these.

19. Magnet A has actually twice the magnetic field strength the Magnet B and also at a details distance traction on magnet B with a pressure of 100 N. The quantity of pressure that magnet A exerts on magnet B is

A. At or about 50 N. B. Precisely 100 N. C. More information is needed.

Reasoning: based on the Newton"s 3rd law, they use equal and also opposite forces.

20. The primary of a transformer is the coil linked to

A. The load. B. The Internet. C. the power line. D. Nobody of these.

21. Transformers usage ac so there will be the required

A. Carry of power from coil come coil. B. Voltage because that transformation. C. Adjust in magnetic field for operation. D. Adjust in entry current. E. Magnetic ar intensities.

22. Once a bar magnet is broken in two, each item is

A. Together magnetic together the initial magnet. B. Actually more powerful than the initial magnet. C. In ~ most fifty percent as strong as the initial magnet. D. No longer magnetic.

23. The metal detectors that civilization walk with at airports operate via

A. Ohm"s law. B. Faraday"s law. C. Coulomb"s law. D. Newton"s laws. E. Polite laws.

Reasoning: view chapter 25.

24. A possible cause for the visibility of the Earth"s magnetic field is

A. Moving charges in the liquid component of the Earth"s core. B. An excellent numbers of very slow moving charges in the Earth. C. Convection currents in the liquid component of the Earth"s core. D. Every one of these. E. Nobody of these.

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25. A maker that transforms electrical energy to mechanical energy is a

A. Generator. B. motor. C. Transformer. D. Magnet. E. Nobody of these.