Exercise :: Materials and Components - Section 1
- Materials and Components - Section 1
- Materials and Components - Section 2
- Materials and Components - Section 3
- Materials and Components - Section 4
- Materials and Components - Section 5
- Materials and Components - Section 6
- Materials and Components - Section 7
- Materials and Components - Section 8
- Materials and Components - Section 9
41. | If n denotes principal quantum number, the angular quantum number l = 0, 1... (n - 1). |
|||
Answer: Option A Explanation: Angular quantum number determines the angular momentum of electron. |
42. | Assertion (A): In a perfect capacitor, the current density is given by ω ∈_{0}E_{0}∈^{'}_{r}cos(ωt + 90°), where ∈_{r}^{'} is real part of dielectric constant. Reason (R): In a perfect capacitor, dielectric losses are zero. |
|||||||
Answer: Option A Explanation: If dielectric losses are zero, the current in capacitor leads the applied voltage by 90°. Also imaginary part of is ∈_{r} is zero. |
43. | Assertion (A): For a solenoid having N turns, . Reason (R): For all magnetic materials, B increases linearly with I. |
|||||||
Answer: Option C Explanation: Increase of B with I is not linear. Hence R is false. |
44. | 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(a_{e} + a_{i} + μ^{2}_{p} / 3kT)E. |
|||||||
Answer: Option A Explanation: The slope of the line in figure is . Since the total polarization is as given by the expression, we can find the permanent dipole moment of the molecules from the slope. |
45. | Assertion (A): If E is available energy state eV and E_{F} is Fermi level, then probability of energy state E being occupied = 0.5. Reason (R): . |
|||||||
Answer: Option B Explanation: E = E_{F}, f(E) = 0.5. |