If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is

A. 8 10^6 N

B. 9 10 ^9 N

C. 10^6 N

D. 5 10^6 N

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    A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 10^-6
  14. What is the unit of reluctance?
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  16. The physical motion resulting from the forces of magnetic fields is called
  17. If the length and area of cross-section of a wire are doubleda then its resistance
  18. Defined as the flux density produced in it due to its own induced magnetism
  19. Magnetic fields do not interact with
  20. Back emf refers to the
  21. Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
  22. What determines the atomic number of an element?
  23. What is the diameter of an atom?
  24. The simplest type of atom to exist is the ______ atom.
  25. The magnetic field inside a solenoid
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  27. A group of magnetically aligned atoms is called
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