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  • Question

  • Assertion (A): From the slope of the line in Figure, we can find permanent dipole moment of the molecules.

    Reason (R): Total polarization of a polyatomic gas is given by P = N(ae + ai + ?2p / 3kT)E.
    Assertion (A): From the slope of the line in Figure, we can find permanent dipole moment of the mole


  • Options
  • A. Both A and R are true and R is correct explanation of A
  • B. Both A and R are true but R is not correct explanation of A
  • C. A is true but R is false
  • D. A is false but R is true

  • Correct Answer
  • Both A and R are true and R is correct explanation of A 

    Explanation
    The slope of the line in figure is Assertion (A): From the slope of the line in Figure, we can find permanent dipole moment of the mole.

    Since the total polarization is as given by the expression, we can find the permanent dipole moment of the molecules from the slope.

    Materials and Components problems

    Search Results

    • 1. Assertion (A): At a temperature of 1000 K, thermionic emission current is about 0.1 A/cm2 of surface.

      Reason (R): Thermionic emission current is given by Ith = SA0 T2 e-Ew/kT.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 2. In a coaxial cable, braided copper is used for

    • Options
    • A. conductor
    • B. shield
    • C. dielectric
    • D. jacket
      • Discuss
    • 3. Hydrogen is used in

    • Options
    • A. large size transformers
    • B. MCB
    • C. large size generators
    • D. circuit breakers
      • Discuss
    • 4. A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be

    • Options
    • A. halved
    • B. kept the same
    • C. doubled
    • D. made 4 times
      • Discuss
    • 5. For a permanent magnetic material

    • Options
    • A. the residual induction and coercive field should be large
    • B. the residual induction and coercive field should be small
    • C. area of hysteresis loop should be small
    • D. initial relative permeability should be high
      • Discuss
    • 6. Assertion (A): Electronic and Ionic polarization in a polyatomic gas are independent of temperature.

      Reason (R): The orientation polarization is independent of temperature.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 7. In atomic physics, a state with l = 0 is called p state.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Assertion (A): In a perfect capacitor, the current density is given by ? ?0E0?'rcos(?t + 90°), where ?r' is real part of dielectric constant.

      Reason (R): In a perfect capacitor, dielectric losses are zero.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 9. The attraction between the nucleus and valence electron of copper atom is

    • Options
    • A. zero
    • B. weak
    • C. strong
    • D. either zero or strong
      • Discuss
    • 10. The minority carrier life time and diffusion constant in a semiconducting material are 100 ?s and 100 cm2/s respectively. The diffusion length of carriers is

    • Options
    • A. 0.1 cm
    • B. 0.01 cm
    • C. 0.0141 cm
    • D. 1 cm
      • Discuss

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