Electricity and Magnetic Fundamentals

221. The temperature coefficient of resistance of eureka is

1. positive
2. negative
3. almost zero
4. infinite

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222. The temperature coefficient of resistance of insulators is

1. zero
2. negative
3. positive
4. infinite

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223. The temperature coefficient of resistance of semiconductors is

1. positive
2. zero
3. negative
4. infinite

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224. The tiniest element of matter

1. Atom
2. Proton
3. Electron
4. Neutron

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225. The total number of magnetic lines of force in a magnetic field is called

1. Magnetic flux
2. Magnetic flux density
3. Magnetic flux intensity
4. Magnetic potential

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226. The uncharged particles which have no effect on its atomic charge.

1. Nucleons
2. Electrons
3. Protons
4. Neutrons

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227. The unit of electrical energy is

1. Joule
2. Watt- second
3. Kilowatt- hour
4. All of these

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228. The unit of flux density is

1. Wb/m
2. Tesla
3. At/m
4. N/Wb

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229. The unit of flux is _________ in cgs system.

1. Tesia
2. Gilbert
3. Maxwell
4. Oersted

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230. Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.

1. Ewing's theory of ferromagnetism
2. Oersted's ferromagnetism theory
3. Maxwell's magnetic theory
4. Ampere's circuital law

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