The classes of solid dielectrics are
Answer: C
No answer description available for this question.
Enter details here
Assertion (A): In a perfect capacitor, the current density is given by ω ∈0E0∈'rcos(ωt + 90°), where ∈r' is real part of dielectric constant.
Reason (R): In a perfect capacitor, dielectric losses are zero.
Answer: A
If dielectric losses are zero, the current in capacitor leads the applied voltage by 90°.
Also imaginary part of is ∈r is zero.
Enter details here
Ferroelectric materials are those which
Answer: B
Ferroelectric materials have permanent polarization.
Enter details here
Assertion (A): Atomic number of sodium is 11.
Reason (R): Sodium has a body centred cubic lattice.
Answer: B
Atomic number is not dependent on lattice structure.
Enter details here
Inductors used at V.H.F. are made using
Answer: D
Thin film technique ensure low hysteresis and eddy current losses.
Enter details here
For a photoconductor with equal electron and hole mobilities and perfect ohmic contacts at the ends, an increase in intensity of optical illumination results in
Answer: C
It is the characteristic of a photoconductor that its resistance decreases with increase in illumination.
Enter details here
Resistivity of rubber is about
Answer: D
No answer description available for this question.
Enter details here
In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.
Answer: A
In a metal valence electrons are shared by all atoms.
Enter details here
Diamond is a paramagnetic material.
Answer: B
Diamond is diamagnetic.
Enter details here
Assertion (A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magnetic field.
Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field.
Answer: C
Orbital magnetic moment is equal to (-e/2m).
Enter details here