Electricity and Magnetic Fundamentals

271. When the ferromagnetic substance is inserted in a current- carrying solenoid, the magnetic field is

1. Greatly decreased
2. Greatly increased
3. Slightly decreased
4. Slightly increased

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272. When the relative permeability of a material is slightly less than 1, it is called _________ material.

1. diamagnetic
2. ferromagnetic
3. paramagnetic
4. non-magnetic

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273. When the relative permeability of a material is much greater than 1, it is called _________ material.

1. diamagnetic
2. ferromagnetic
3. paramagnetic
4. non-magnetic

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274. When the relative permeability of a material is slightly more than 1, it is called _________ material.

1. diamagnetic
2. ferromagnetic
3. paramagnetic
4. non-magnetic

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275. Whenever a conductor cuts magnetic flux, an emf is induced in it. This is known as

1. Coulomb's law
2. Joule's law
3. Faraday's law
4. Ohm∧s law

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276. Whenever a flux inking a coil or current changes, an emf is induced in it. This is known as

1. Joule's Law
2. Coulomb's Law
3. Faraday's first law of electromagnetic induction
4. Faraday's second law of electromagnetic induction

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277. Which element has four valence electrons?

1. Conductor
2. Insulator
3. Semiconductor
4. Semi- insulator

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278. Which of the following electric quantities is vector in character?

1. Field
2. Charge
3. Energy
4. Potential Difference

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279. Which of the following has the highest permeability?

1. Soft iron
2. Steel
3. Air
4. Permalloy

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280. Which of the following has the least number of valence electrons?

1. Conductor
2. Semiconductor
3. Insulator
4. Semi- insulator

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