Which of the following statements is TRUE?

A. Silicon dioxide is a good

B. The current carriers in conductors are valence electrons

C. For conductorsa the valence electron are strongly attracted to the nucleus

D. The valence electrons are located in the nucleus of an atom

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  1. What is the SI unit of magnetic flux?
  2. Which of the following statements is TRUE?
  3. Which of the following is a vector quantity?
  4. Who discovered the most important electrical effects which is the magnetic effect?
  5. If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
  6. The K shell or the first shell has how many permissible number of orbiting electrons?
  7. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  8. A positively charged body has
  9. Which of the following magnetic materials can be easily magnetized in both direction?
  10. If the number of valence electrons of an atom is less than 4a the substance is called
  11. The dielectric constant of most materials lies between
  12. What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred…
  13. What is another name for relative permittivity?
  14. The force of attraction or repulsion between two magnetic poles is inversely proportional to the square…
  15. In electro-mechanical conversion devices like generators and motors the reason why a small air gap is…
  16. An electron- volt (eV) is a unit of
  17. The phenomenon by which a subtracts pieces of iron
  18. If the magnetic material is located within a coil through which alternating current (60 Hz frequency)…
  19. The core of a magnetic equipment uses a magnetic material with
  20. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
  21. Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
  22. Electrons at the outer shell are called
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    When the current flowsa the magnetic field . conductor is in what direction?
  24. A group of magnetically aligned atoms is called
  25. A negative ion results when an atom gains an additional
  26. A one cubic cm of copper has how many free electrons at room temperature?
  27. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa…
  28. Who developed the electromagnetic theory of light in 1862?
  29. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying…
  30. What is the main advantage of temporary magnets?