Diamagnetic materials do not have permanent magnetic dipoles.

More Questions from Materials and Components

• Assertion (A): Rochelle salt and Barium titanate are both ferroelectric. Reason (R): Ferroelectric materials exhibit hysteresis effect.
• If a metal specimen has n valence electrons per m3 each having charge e and mass m and t is the relaxations time, the conductivity is
• Assertion (A): Intrinsic resistivity of silicon is lower than that of germanium. Reason (R): Magnitude of free electron concentration in germanium is more than that of silicon.
• In a conductor the current flow is due to
• Assertion (A): The equation D = ∈0∈rE is applicable only to isotropic materials. Reason (R): In polycrystalline materials, the directional effects are absent.
• A dielectric of relative permittivity ∈r is subjected to a homogeneous electric field E. The dipole moment P per unit volume is given by
• As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = ri + aT, where ri and a are constants and T is absolute temperature. At very low temperatures
• Consider the following statements An iron cored choke is non linear and passive device. A carbon resistor kept in sunlight is a time invariant and passive device. A dry cell is a time varying and active device. An air capacitor is time invariant and passive device. Of these statements
• The units for ∈r are
• A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of

Discussion & Comments