When the magnetic field is parallel to a surface, then the magnetic flux through the surface is:
  • infinite
  • zero
  • small but not zero
  • large but not infinite.
The energy stored in a 50 mH inductor carrying a current of 4 A is:
  • 0.1 J
  • 0.4 J
  • 0.04 J
  • 0.01 J
The flux linked with a coif at any instant t is given by ∅ = 10t² - 50t +The induced emf at t = 35 is:
  • 10 V
  • 190 V
  • -190 V
  • -10 V
Two coils of self inductance 2 mil and 8 mil are placed so close together that the effective flux in one coil is completely linked with other. The mutual inductance between these coils is :
  • 4 mH
  • 16 mH
  • 10 mH
  • 6 mH
The core of a transformer is laminated because:
  • rusting of core may be prevented
  • ratio of voltage in primary and secondary may be increased.
  • energy losses due to eddy current may be minimised
  • The weight of transformer may be reduced
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0