Electricity and Magnetic Fundamentals

241. What is another name for relative permittivity?

1. Dielectric strength
2. Electric intensity
3. Potential gradient
4. Dielectric constant

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242. What is the cgs unit of magnetomotive force?

1. Gilbert
2. Ampere- turn
3. Maxwell
4. Weber

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243. What is the diameter of an atom?

1. About 1O∧-1O m
2. About 10∧-10 cm
3. About 10∧-10 mm
4. About 10∧-10 μm

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244. What is the main advantage of temporary magnets?

1. The magnetic flux can be changed.
2. Hysteresis can be decreased.
3. Magnetic materials can be used.
4. Abundance of ferromagnetic material that can be temporarily magnetized.

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245. What is the maximum number of electrons that can be accommodated in the last orbit of an atom?

1. 4
2. 2
3. 8
4. 18

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246. What is the measure of the density and sign of the electric charge at a point relative to that at some time?

1. Electric potential
2. Electric charge
3. Electric current
4. Electric intensity

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247. What is the other name for dielectric strength?

1. Breakdown voltage
2. Electric intensity
3. Potential gradient
4. Dielectric constant

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248. What is the practical unit of electrical energy?

1. Watt
2. Kilowatt-hour
3. Kilowatt-second
4. Megawat-hour

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249. What is the relative permittivity of air?

1. 0
2. 1
3. 8.854 X 10∧-12
4. 4π X 10∧-7

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250. What is the reluctance of a magnetic path having a length of 2x 10∧-3m and cross- sectional area of 2.5 x 10∧-3 m∧2?

1. 6366 A.t/Wb
2. 6000 A.t/Wb
3. 8x10∧-3 A.t/Wb
4. 0.8 A.t/Wb

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