CBSE Class-12 Physics Chapter-03
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Questions and Answers

What is the SI unit of conductivity?

  • $rac{ ext{ohm}}{m}$
  • S/m (correct)
  • $rac{m}{ ext{ohm}}$
  • mS/m

    • What does the current density vector J represent?

  • Magnitude of drift velocity per unit electric field
  • Current per unit area flowing through area (correct)
  • Number density of charge carriers
  • Net charge passing per unit time through the area

    • What is the formula for resistivity?

  • $\rho = \frac{1}{I}$
  • $\rho = \frac{1}{\sigma}$ (correct)
  • $\rho = \frac{1}{J}$
  • $\rho = \frac{1}{\tau}$

    • What is the formula for mobility?

    <p>$rac{V_d}{E}$</p> Signup and view all the answers

    What is the formula for current through a given area of a conductor?

    <p>$I = neV_dA$</p> Signup and view all the answers

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