Electricity and Magnetic Fundamentals

291. Which of the following statements is TRUE?

1. Silicon dioxide is a good
2. The current carriers in conductors are valence electrons
3. For conductors, the valence electron are strongly attracted to the nucleus
4. The valence electrons are located in the nucleus of an atom

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292. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?

1. Luigi Galvani
2. Hans Christian Oersted
3. Charles Coulomb
4. Andre Ampere

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293. Who demonstrated the theory of electromagnetic induction in 1831?

1. Michael Faraday
2. Andre Ampere
3. James Clerk Maxwell
4. Charles Coulomb

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294. Who developed the electromagnetic theory of light in 1862?

1. Heinrich Rudolf Hertz
2. Wilhelm Rontgen
3. James Clerk Maxwell
4. Andre Ampere

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295. Who discovered superconductivity in 1911?

1. Kamerlingh Onnes
2. Alex Muller
3. Geory Bednorz
4. Charles Coulomb

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296. Who discovered that a current-carrying conductor would move when placed in a magnetic field?

1. Michael Faraday
2. Andre Ampere
3. Hans Christian Oersted
4. Gustav Robert Kirchhoff

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297. Who discovered the most important electrical effects which is the magnetic effect?

1. Hans Christian Oersted
2. Sir Charles Wheatstone
3. Georg Ohm
4. James Clerk Maxwell

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298. Who discovered the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?

1. Luigi Galvani
2. Hans Christian Oersted
3. Andre Ampere
4. Charles Coulomb

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299. Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required for iron part of a magnetic circuit?

1. Because air is a gas
2. Because air has the highest relative permeability
3. Because air is a conductor of magnetic flux
4. Because air has the lowest relative permeability

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