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ICSE Class 10 Magnetism: electromagnetism and uses of the electromagnet — practice questions — page 2

Explore 50 free Magnetism: electromagnetism and uses of the electromagnet questions in ICSE Class 10 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetism: electromagnetism and uses of the electromagnet questions and exercises with answers

Showing questions 31–50 of 50.

For Fleming's left hand, align the index finger withRead the answer and worked solution →Fleming's left-hand middle finger points alongRead the answer and worked solution →A wire's current reverses at unchanged strength and field. Its forceRead the answer and worked solution →Both current and magnetic field reverse. The wire's force directionRead the answer and worked solution →A simple brushed DC motor normally has which current collector?Read the answer and worked solution →In a hand-cranked generator, useful energy changes fromRead the answer and worked solution →Which principle produces voltage in a rotating generator coil?Read the answer and worked solution →The current from a simple AC generatorRead the answer and worked solution →Which rings connect a simple AC generator's coil to its external circuit?Read the answer and worked solution →Induced current direction in a generator is found usingRead the answer and worked solution →A magnet stays fixed beside a fixed closed coil. After settling, induced current isRead the answer and worked solution →A magnet enters then leaves a closed coil. CurrentRead the answer and worked solution →Pushing a magnet faster towards a closed coil generally givesRead the answer and worked solution →Two fixed coils: switch-off vs switch-on induces a pulse that isRead the answer and worked solution →In a transformer, input supply and output load connect respectively toRead the answer and worked solution →A transformer's shared magnetic core mainlyRead the answer and worked solution →For long-distance transmission at higher AC voltage, use aRead the answer and worked solution →Which lowers AC supply voltage for an appliance?Read the answer and worked solution →Current flows east and field points north. The wire's force pointsRead the answer and worked solution →In a simple two-pole DC motor, its split ringRead the answer and worked solution →

Worked practice questions

For Fleming's left hand, align the index finger with

  1. Magnetic field direction
  2. Conventional current direction
  3. Potential difference direction
  4. Force on the conductor
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Correct answer: A. Magnetic field direction

The forefinger of Fleming's left hand points along the magnetic field.

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Fleming's left-hand middle finger points along

  1. Magnetic field
  2. Induced voltage
  3. Conventional current
  4. Conductor's motion
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Correct answer: C. Conventional current

Fleming's left-hand middle finger represents conventional current through the conductor.

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A wire's current reverses at unchanged strength and field. Its force

  1. Keeps direction and strength
  2. Keeps direction, doubles strength
  3. Reverses and doubles strength
  4. Reverses at same strength
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Correct answer: D. Reverses at same strength

Reversing current while keeping the field fixed reverses the magnetic force.

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