NCERT/Class 12/Physics/Moving Charges and Magnetism

Moving Charges and Magnetism

Class 12 · Physics

59 questions22 easy24 medium13 hard

Sample Questions

Q1.The magnetic field at the center of a circular loop of radius R carrying current I is:

  • Aμ₀I/(2R)
  • Bμ₀I/(4πR)
  • Cμ₀IR/2
  • Dμ₀I/(2πR)

Q2.The magnetic force on a wire carrying current I is F = IL × B. If the wire makes angle 30° with B, what is the force for I=2A, L=3m, B=5T?

  • A30 N
  • B15 N
  • C15√3 N
  • D7.5 N

Q3.The cyclotron is used to accelerate:

  • ANeutrons
  • BPositively charged particles (protons, alpha particles)
  • CElectrons only
  • DPhotons

Q4.The magnetic field at distance r from a long straight wire carrying current I is:

  • Aμ₀I/(4πr)
  • Bμ₀I/(2πr)
  • Cμ₀I/(2r)
  • Dμ₀I/r

Q5.A galvanometer is converted to a voltmeter by connecting:

  • AA low resistance in parallel
  • BA high resistance in series
  • CA low resistance in series
  • DA high resistance in parallel

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Ampere's circuital lawBiot-Savart lawCyclotronForce on current-carrying conductorLorentz forceMagnetic field due to circular loopMagnetic field due to straight wireMagnetic force on moving chargeMagnetic momentMoving coil galvanometerSolenoid and toroidTorque on current loop

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