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The permittivity is also called
nswer: b Explanation: The term permittivity or dielectric constant is the measurement of electrostatic energy stored within it and therefore depends on the material.
nswer: b
See lessExplanation: The term permittivity or dielectric constant is the measurement of
electrostatic energy stored within it and therefore depends on the material.
Ceramic materials possess which of the following properties?
Answer: c Explanation: Ceramic materials are generally brittle. Since these materials are used in capacitors, they have higher dielectric constant than polymer. With respect to energy, they possess high electrostatic energy due to very high dielectric constant (W α ε).
Answer: c
See lessExplanation: Ceramic materials are generally brittle. Since these materials are used in
capacitors, they have higher dielectric constant than polymer. With respect to energy,
they possess high electrostatic energy due to very high dielectric constant (W α ε).
Debye is the unit used to measure
Answer: b Explanation: Debye is the standard unit for measurement of electric dipole moment. 1 Debye = 3.336 x 10-30 Coulomb-meter.
Answer: b
See lessExplanation: Debye is the standard unit for measurement of electric dipole moment. 1
Debye = 3.336 x 10-30 Coulomb-meter.
Superconductors exhibit which of the following properties?
Answer: c Explanation: Since superconductors have very good conductivity at low temperatures (σ->∞), they have nearly zero resistivity and exhibit perfect diamagnetism.
Answer: c
See lessExplanation: Since superconductors have very good conductivity at low temperatures (σ->∞), they have nearly zero resistivity and exhibit perfect diamagnetism.
If the electric potential is given, which of the following cannot be calculated?
Answer: a Explanation: Using potential, we can calculate electric field directly by gradient operation. From E, the flux density D can also be calculated. Thus it is not possible to calculate energy directly from potential.
Answer: a
See lessExplanation: Using potential, we can calculate electric field directly by gradient
operation. From E, the flux density D can also be calculated. Thus it is not possible to
calculate energy directly from potential.
When curl of a path is zero, the field is said to be conservative. State True/False.
Answer: a Explanation: By Stoke’s theorem, when curl of a path becomes zero, then ∫ E.dl = 0. In other words the work done in a closed path will always be zero. Fields having this property is called conservative or lamellar fields.
Answer: a
See lessExplanation: By Stoke’s theorem, when curl of a path becomes zero, then
∫ E.dl = 0. In other words the work done in a closed path will always be zero. Fields
having this property is called conservative or lamellar fields.
The work done in moving a test charge from one point to another in an equipotential surface is zero. State True/False.
Answer: a Explanation: Since the electric potential in the equipotential surface is the same, the work done will be zero
Answer: a
See lessExplanation: Since the electric potential in the equipotential surface is the same, the
work done will be zero
Equipotential surface is a
Answer: c Explanation: Equipotential surface is an imaginary surface in an electric field of a given charge distribution in which all the points on the surface are at the same electric potential.
Answer: c
See lessExplanation: Equipotential surface is an imaginary surface in an electric field of a given charge distribution in which all the points on the surface are at the same electric
potential.
Calculate the energy in an electric field with permittivity of 56 and field intensity of 36π(in μJ)
Answer: a Explanation: The energy in an electric field is given by, W = 0.5 x D x E. Since D = εE, we get W = 0.5 x ε x E2. On substituting the data, we get 3.16 microjoule.
Answer: a
See lessExplanation: The energy in an electric field is given by, W = 0.5 x D x E. Since D = εE,
we get W = 0.5 x ε x E2. On substituting the data, we get 3.16 microjoule.
Calculate the energy in an electric field with flux density 6 units and field intensity of 4 units.
Answer: a Explanation: The energy in an electric field is given by, W = 0.5 x D x E, where D = 6 and E = 4. We get W = 0.5 x 6 x 4 = 12 units.
Answer: a
See lessExplanation: The energy in an electric field is given by, W = 0.5 x D x E, where D = 6
and E = 4. We get W = 0.5 x 6 x 4 = 12 units.