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A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?

A. 30 ohms

B. 20 ohms

C. 15 ohms

D. 7 ohms

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  1. Hydrogen is an example of a _____ material.
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  4. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  5. An effect which is generally used in the gausameter to measure flux density.
  6. Electric field intensity at a point due to a given charge ______ if the relative permittivity of the…
  7. Permeance is analogous to
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  11. The emission of electrons from hot bodies is called
  12. A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
  13. If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's…
  14. The magnetic field inside a solenoid
  15. The total number of magnetic lines of force in a magnetic field is called
  16. Which of the following is used by temporary magnets as the magnetic material?
  17. A good conductor has how many valence electrons?
  18. One of the solid structures in which the position of the atoms or ions are predetermined
  19. Which of the following magnetic materials can be easily magnetized in both direction?
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  22. The temperature coefficient of resistance of eureka is
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  24. The greater percentage of materials is _________.
  25. The force between two magnetic poles is _____ their poles strength.
  26. A one cubic cm of copper has how many free electrons at room temperature?
  27. Amorphous solid is also called
  28. The magnetic flux of 2000 lines is how many Maxwells?
  29. Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field…
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