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
1 henry is equal to :
  • weber ampere
  • None of these
  • \(\frac{\text{weber}}{\text{ampere}}\)
  • \(\frac{\text{weber}}{\text{Volt}}\)
Which of the following is not equal to a henry?
  • \(\frac{\text{Volt} \text{second}}{\text{ampere}}\)
  • \(\frac{\text{Volt} \text{second}^2}{\text{Coulomb}}\)
  • \(\frac{\text{Volt}^2\text{ second}}{\text{Coulomb}}\)
  • \(\frac{\text{Jole} \text{second}}{\text{Coulomb}^2}\)
0 h : 0 m : 1 s

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