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Bihar Board Class 12 (Science) Electromagnetic Induction & Alternating Current — practice questions

Explore 78 free Electromagnetic Induction & Alternating Current questions in Bihar Board Class 12 (Science) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Induction & Alternating Current questions and exercises with answers

Showing questions 1–30 of 78.

The SI unit of magnetic flux is the:Read the answer and worked solution →The SI unit of inductance is the:Read the answer and worked solution →Induced emf depends on the time rate of change of:Read the answer and worked solution →The emf Blv produced by a moving conductor is called:Read the answer and worked solution →Whose experiments led to modern generators and transformers?Read the answer and worked solution →Lenz's law fixes which feature of the induced emf?Read the answer and worked solution →Moving a magnet towards a coil induces in the coil an:Read the answer and worked solution →The induced current opposes the change that produced it, because:Read the answer and worked solution →Because the induced current opposes the motion, the mover must:Read the answer and worked solution →The constant linking flux linkage to current is called:Read the answer and worked solution →Inductance depends only on the coil's geometry and its:Read the answer and worked solution →The constant M linking two neighbouring coils is called:Read the answer and worked solution →The constant L for a single coil is called its:Read the answer and worked solution →Mutual inductance is also called the coefficient of:Read the answer and worked solution →An alternative name for the SI unit of magnetic flux is:Read the answer and worked solution →If the induced current did not oppose the change, one could get:Read the answer and worked solution →A galvanometer connected to a coil shows deflection only when:Read the answer and worked solution →Flux through a coil can be changed without moving it, by changing:Read the answer and worked solution →The negative sign in Faraday's law expresses which law?Read the answer and worked solution →The effective value of an alternating current is called its:Read the answer and worked solution →The household line voltage of 220 V is which kind of value?Read the answer and worked solution →An inductor in an ac circuit offers:Read the answer and worked solution →A capacitor in an ac circuit offers:Read the answer and worked solution →The SI unit of reactance is the:Read the answer and worked solution →The total opposition of an ac circuit is called its:Read the answer and worked solution →Alternating voltages are stepped up or down by means of:Read the answer and worked solution →The rms current equals the dc current that would produce the same:Read the answer and worked solution →At resonance in a series LCR circuit, the impedance is:Read the answer and worked solution →At resonance the current amplitude in the circuit is:Read the answer and worked solution →Besides an inductor, resonance needs the circuit to contain a:Read the answer and worked solution →

Worked practice questions

The SI unit of magnetic flux is the:

  1. Weber
  2. Farad
  3. Henry
  4. Joule
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Correct answer: A. Weber

1. Magnetic flux measures field crossing an area. 2. It has its own named SI unit. 3. That unit is the weber, also written as tesla metre squared. 4. So the answer is weber. _Source: syllabus Physics, Ch 6 'Electromagnetic Induction'_

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The SI unit of inductance is the:

  1. Joule
  2. Henry
  3. Tesla
  4. Weber
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Correct answer: B. Henry

1. Inductance links flux to the current producing it. 2. Its unit honours an American experimenter. 3. That unit is the henry, denoted H. 4. So the answer is henry. _Source: syllabus Physics, Ch 6 'Electromagnetic Induction'_

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Induced emf depends on the time rate of change of:

  1. Coil material
  2. Room temperature
  3. Magnetic flux
  4. Wire thickness
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Correct answer: C. Magnetic flux

1. A steady field through a coil induces nothing. 2. Only a changing linkage drives an emf. 3. The emf equals the time rate of change of magnetic flux. 4. So the answer is magnetic flux. _Source: syllabus Physics, Ch 6 'Electromagnetic Induction'_

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