Electrostatic

21. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is

1. 100 kV/m
2. 10 kV/m
3. 5 kV/m
4. 2 kV/m

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22. A region around a stationary electric charge has

1. an electric field
2. a magnetic field
3. both (a) and (6)
4. none of the above

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23. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is

1. 62 x 105 V/m
2. 72 x 105 V/m
3. 82 x 105 V/m
4. 92 x 105 V/m

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24. A unit tube of flux is known as tube

1. Newton
2. Faraday
3. Michale
4. None of the above

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25. Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as

1. milli-coulomb
2. micro-coulomb
3. pico-coulomb
4. coulomb

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26. Air capacitors are generally available in the range

1. 10 to 400 pF
2. 1 to 20 pF
3. 100 to 900 pF
4. 20 to 100 pF

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27. An electrolytic capacitor can be used for

1. D.C. only
2. AC. only
3. both D.C. as well as A.C.
4. all of the above

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28. An electrolytic capacitor is generally made to provide

1. low capacitance
2. fixed capacitance
3. variable capacitance
4. large value of capacitance

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29. An uncharged conductor is placed near a charged conductor, then

1. the uncharged conductor gets charged by conduction
2. the uncharged conductor gets charged by induction and then attracted towards the charging body
3. the uncharged conductor is attracted first and then charged by induction
4. it remains as such

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30. at a point is equal to the negative potential gradient at that point.

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

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