CBSE  /  Class 12  /  Physics  /  Moving Charges and Magnetism

  • 1. 
    Tesla is a unit of:

  • electric flux
  • magnetic flux
  • magnetic field
  • electric field

  • 2. 
    10 eV electron is circulating in a plane at right angle to a uniform field of magnetic induction 10-1 Wb/m² (1G). The orbital radius of electron is:

  • 12 cm
  • 16 cm
  • 11 cm
  • 18 cm

  • 3. 
    A cyclotron can be used to produce high energy:

  • neutrons
  • deutrons
  • β particles
  • α partifcles

  • 4. 
    The radius of the trajectory of a charged particle in a uniform magnetic field is proportional to the:

  • charge on the particle
  • energy of the particle
  • momentum of the particle
  • all the above

  • 5. 
    The force \(\vec{F}\) experienced by a particle of charge q moving with velocity \(\vec{v}\) in a magnetic field \(\vec{B\) is given by,

  • \(\vec{F}\) = q(\(\vec{F}\) × \(\vec{B}\))
  • \(\vec{F}\) = q(\(\vec{B}\) × (\(\vec{b}\))
  • \(\vec{F}\) = q(\(\vec{v}\) × (\(\vec{B}\))
  • \(\vec{F}\) = q(\(\vec{v}\) × \(\vec{B}\))

  • 6. 
    The torque acting on a magnetic dipole of moment [latex]\vec{p_m}[/latex] when placed in a magnetic field \(\vec{B}\) is:

  • pmB
  • \(\vec{p_m}\)× \(\vec{B}\)
  • \(\vec{p_m}\)\(\vec{B}\)
  • \(\frac{p_m}{B}\)

  • 7. 
    In thomson spectrograph \(\vec{E}\) ⊥ \(\vec{B}\), then velocity of electron beam will be:

  • |\(\vec{E}\)|/|\(\vec{B}\)|
  • \(\vec{E}\) × \(\vec{B}\)
  • |\(\vec{B}\)|/|\(\vec{E}\)|
  • E² / B²
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