Q. A good dielectric should have

View solution

Q. Magnetic hysteresis phenomenon is explained by

View solution

Q. The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m²) and dT/dx (°C per metre) is

View solution

Q. Assertion (A): The equation D = ∈₀∈ᵣE is applicable only to isotropic materials.

Reason (R): In polycrystalline materials, the directional effects are absent.

View solution

Q. Assertion (A): For a dielectric, P = ∈₀(∈ᵣ - 1) E.

Reason (R): Dipole moment per unit volume is called polarization of dielectric.

View solution

Q. Assertion (A): Ferrites are very useful at very high frequencies.

Reason (R): Ferrites have high permeability and high resistivity.

View solution

Q. In a conductor the current flow is due to

View solution

Q. When an electron moves at velocity v in combined electric and magnetic fields E and H, the Lorentz force F is F = - e(E + v x B).

View solution

Q. When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are

View solution

Q. For dielectrics in alternating field, polarizability αe is a complex quantity. The imaginary part of ae is zero for

View solution

Q. In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to

View solution

Q. The induced magnetic dipole moment has a direction opposite to the applied magnetic field.

View solution

Q. An atom of polarizability a is placed in a homogeneous electric field E. The energy stored in polarized atom is

View solution

Q. If B, H and M denote flux density, field intensity and magnetisation, B = μ₀ (H + M).

View solution

Q. A capacitor can be represented by a capacitance and resistance in parallel. For a good capacitor, this parallel resistance should be

View solution

Q. Assertion (A): Ionic solids, in general, have no electrical conductivity.

Reason (R): In ionic solids, electrons are tightly bound to the nucleus.

View solution

Q. Tesla is a unit of

View solution

Q. If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes

View solution

Q. In which of the following semiconductor are holes minority carriers

View solution

Q. At 0 K, silicon and germanium behave like monoatomic crystals.

View solution