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KCET Electromagnetic Induction — practice questions — page 2

Explore 34 free Electromagnetic Induction questions in KCET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Induction questions and exercises with answers

Showing questions 31–34 of 34.

Sort what each inductance needsRead the answer and worked solution →Knock out the false induction claimsRead the answer and worked solution →Catch the false line on inductionRead the answer and worked solution →Match each quantity to its unitRead the answer and worked solution →

Worked practice questions

Sort what each inductance needs

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Left
Self inductance
Items
  1. Region
    Self inductance
    Item
    One coil alone
  2. Region
    Self inductance
    Item
    Its own turns
  3. Region
    Mutual inductance
    Item
    Two coils needed
  4. Region
    Mutual inductance
    Item
    Coil orientation
  5. Region
    both
    Item
    Set by geometry
  6. Region
    both
    Item
    Core dependent
Right
Mutual inductance
Instructions
Drag each chip into the self inductance ring, the mutual inductance ring, or the overlap.
_Source: Maharashtra Balbharati Std XII Physics, Ch 12 "Electromagnetic Induction" §12.6_

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Knock out the false induction claims

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Questions
  1. Question
    Three of these statements about inducing a current are false.
    Choices
    1. Item
      A magnet must move relative to the coil
      Correct
      Yes
    2. Explanation
      With no relative motion the flux never changes, so no emf appears.
      Item
      A still magnet in a coil induces one
    3. Explanation
      Lenz's law makes the induced current oppose the change, never help.
      Item
      Induced current adds to the flux change
    4. Explanation
      Changing the loop area or its angle induces a current just as well.
      Item
      Only a stronger magnet induces current
Instructions
Tap the three false statements about inducing a current to clear them from the board.
_Source: OpenStax Physics, Ch 20 Magnetism, section 20.3 Electromagnetic Induction_

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Catch the false line on induction

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Questions
  1. False statement
    The induced current helps the change along.
    Statements
    1. Induced EMF equals the rate at which flux changes.
    2. The induced current opposes the change in flux.
    3. The induced current helps the change along.
  2. False statement
    Energy stored in an inductor is L times I squared.
    Statements
    1. Energy stored in an inductor is L times I squared.
    2. Magnetic flux is measured in webers.
    3. Self induced EMF is minus L times dI by dt.
  3. False statement
    Capacitive reactance rises with frequency.
    Statements
    1. Inductive reactance rises with frequency.
    2. Capacitive reactance rises with frequency.
    3. At resonance the two reactances are equal.
  4. False statement
    At resonance the impedance is at its largest.
    Statements
    1. The LR time constant is L divided by R.
    2. Current reaches 63 per cent after one time constant.
    3. At resonance the impedance is at its largest.
Instructions
Each set of three lines about induced current holds one that is not true. Tap that line.
_Source: Qallery verified question bank, BITSAT, topic Electromagnetic Induction_

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