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What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?

A. Ionic

B. Covalent

C. Metallic

D. Van der Waals

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  1. Electronic current in a wire is the flow of ____________ electrons.
  2. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying…
  3. Which of the following is a paramagnetic material?
  4. What determines the value of the temperature coefficient of resistance of a material?
  5. The permeability of permalloy is
  6. Magnetic field intensity is a ________ quantity.
  7. The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
  8. A magnetic material losses its ferromagnetic properties at a point called
  9. Hysteresis is a phenomenon of _________ in a magnetic circuit.
  10. Materials whose permeabilities are slightly greater than that of free space
  11. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  12. The force between two magnetic poles is _____ the relative permeability of the medium.
  13. What type of bond is formed when there exists some form of collective interactions between the (negatively…
  14. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa…
  15. The electric flux density is a ________ quantity.
  16. The ratio of the permeability of material to the permiabiity of air or vacuum.
  17. Ohm's law cannot be applied to which material?
  18. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
  19. The force between two magnetic poles is _______ their pole strengths.
  20. If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then…
  21. The process by which an emf and hence current is generated or induced in a conductor when there is a…
  22. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  23. An effect which is generally used in the gausameter to measure flux density.
  24. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  25. The mass of proton is __________ the mass of an electron.
  26. Which of the following is a natural magnet?
  27. If the number of valence electrons of an atom is more than 4a the substance is called
  28. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in…
  29. The magnetic field of a bar magnet most closely resembles the magnetic field of
  30. An atom or a group of atoms that carries a net electric charge.