Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Which of the following are conductors?
Answer: c Explanation: Normally, metals are said to be good conductors. Here mercury is the only metal (which is in liquid form). The other options are insulators.
Answer: c
See lessExplanation: Normally, metals are said to be good conductors. Here mercury is the only metal (which is in liquid form). The other options are insulators.
When the electric field becomes zero, which of the following relations hold good?
Answer: b Explanation: The electric flux density of a field is the sum of εE and polarisation P. It gives D = εE + P. When electric field becomes zero, it is clear that D = P.
Answer: b
See lessExplanation: The electric flux density of a field is the sum of εE and polarisation P. It
gives D = εE + P. When electric field becomes zero, it is clear that D = P.
The susceptibility of free space is
Answer: b Explanation: For free space/air, the relative permittivity is unity i.e, εr = 1. Thus χe = εr –1 = 0. The susceptibility will become zero in air.
Answer: b
Explanation: For free space/air, the relative permittivity is unity i.e, εr = 1. Thus χe = εr –1 = 0. The susceptibility will become zero in air.
See lessThe bound charge density and free charge density are 12 and 6 units respectively. Calculate the susceptibility.
Answer: c Explanation: The electric susceptibility is given by, χe = Bound free density/Free charge density. χe = 12/6 = 2. It has no unit.
Answer: c
See lessExplanation: The electric susceptibility is given by, χe = Bound free density/Free charge density. χe = 12/6 = 2. It has no unit.
Find the susceptibility of a material whose dielectric constant is 2.26.
Answer: a Explanation: Electric susceptibility is the measure of ability of the material to get polarised. It is given by, χe = εr – 1.Thus we get 1.26.
Answer: a
See lessExplanation: Electric susceptibility is the measure of ability of the material to get
polarised. It is given by, χe = εr – 1.Thus we get 1.26.
Semiconductors possess which type of bonding?
Answer: b Explanation: Conductors exhibit metallic bonding. Insulators exhibit ionic bonding and semiconductors exhibit covalent bonding due to sharing of atoms.
Answer: b
See lessExplanation: Conductors exhibit metallic bonding. Insulators exhibit ionic bonding
and semiconductors exhibit covalent bonding due to sharing of atoms.
Which of the following properties distinguish a material as conductor, insulator and semiconductor?
Answer: c Explanation: The only parameter that classifies the material as conductor or insulator or semiconductor is the band gap energy. It is the energy required to make the electrons conduct. This is low of conductors, average for semiconductors and very high for insulators. This means it requireRead more
Answer: c
See lessExplanation: The only parameter that classifies the material as conductor or insulator or semiconductor is the band gap energy. It is the energy required to make the electrons conduct. This is low of conductors, average for semiconductors and very high for insulators. This means it requires very high energy to make an insulator conduct.
Insulators perform which of the following functions?
Answer: c Explanation: Insulators is a non-conducting material which prevents the leakage of electric current in unwanted directions. Thus it is used to provide electrical insulation.
Answer: c
See lessExplanation: Insulators is a non-conducting material which prevents the leakage of
electric current in unwanted directions. Thus it is used to provide electrical insulation.
Under the influence of electric field, the dielectric materials will get charged instantaneously. State True/False.
Answer: a Explanation: The dielectrics have the ability of storing energy easily when an electric field is applied as their permittivity is relatively higher than any other materials.
Answer: a
See lessExplanation: The dielectrics have the ability of storing energy easily when an electric
field is applied as their permittivity is relatively higher than any other materials.
Dielectric constant will be high in
Answer: c Explanation: Materials that have very less conductivity like ceramics, plastics have higher dielectric constants. Due to their low conductivity, the dielectric materials are saidb to be good insulators.
Answer: c
See lessExplanation: Materials that have very less conductivity like ceramics, plastics have
higher dielectric constants. Due to their low conductivity, the dielectric materials are saidb to be good insulators.