Biology Forums - Study Force

By what factor is the self-inductance of a solenoid changed if its length is doubled and its number of coil turns is tripled?
 a. 2/9
  c. 3/4
  b. 9/2
  d. 4/3

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[Ques. 2] The wave-related quantity algebraically equivalent to 1/f is:
 a.
  c. A
  b. T
  d.

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[Ques. 3] By what factor is the self-inductance of a solenoid changed if only its cross-sectional area, A, is doubled?
 a. 1/2
  c. 2
  b. 4
  d. 8

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[Ques. 4] Which of the following media cannot support longitudinal waves?
 a. aluminum
  c. string
  b. air
  d. water

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[Ques. 5] By what factor is the self-inductance of a solenoid changed if only its number of coil turns, N, is doubled?
 a. 8
  c. 4
  b. 1/2
  d. 2

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[Ques. 6] A wave produced by a simple harmonic driving force is called a _____ wave.
 a. disturbance
  c. transverse
  b. periodic
  d. longitudinal

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[Ques. 7] What is the self-inductance in a coil that experiences a 3.0-V induced emf when the current is changing at a rate of 37 A/s?
 a. 81 mH
  c. 27 mH
  b. 37 mH
  d. 45 mH

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[Ques. 8] As a gust of wind blows across a field of grain, a wave can be seen to move across the field as the tops of the plants sway back and forth. This wave is a:
 a. transverse wave.
  c. polarized wave.
  b. longitudinal wave.
  d. interference of waves.

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[Ques. 9] A coil with a self-inductance of 0.75 mH experiences a constant current buildup from zero to 15 A in 0.25 s. What is the induced emf during this interval?
 a. 0.045 V
  c. 0.030 V
  b. 0.47 V
  d. 0.019 V

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[Ques. 10] If the torsion constant of the suspension fiber in the Cavendish experiment were doubled, what would happen to the frequency of oscillation? The last two answers have been rounded to 2 significant figures.
 a. It would double.
  c. It would increase by a factor of 1.4.
  b. It would halve.
  d. It would decrease by a factor of 0.71.

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