01․ When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

As C = Aε/d
R = d/(σ A)
CR = A ε/d
d/(σ A) = ε/σ
tanδ = I

_{R}/I_{c}= V/(R.Vω c) = I/(ω CR) So, tan δ = I(ω ε/σ) = σ/(ω ε).02․ An ac voltage source v = v

_{o}sinωt is connected across a parallel plate capacitor C. If the conductor current is i_{c}and the displacement current is i_{d}, then which is true among following relationThe conduction current in the connecting wire
For Parallel plate capacitor of area A and plate thickness d,
C = ε A/d
Electric field E in the dielectric is E = v/d.
So, D = ε E = ε (V

_{o}/d) sin ωt Displacement current i_{d}Therefore, i_{c}= i_{d}.03․ The laplace transform of the fuction f(t) = t is

04․ Conductance of any conductor is expressed as

Conductance is reciprocal of resistance that means conductance = (resistance)

^{ - 1 }. Hence unit of conductance will be ( 1 / Ohm ) and this is known as mho.05․ Three element having conductance G

_{1}, G_{2}and G_{3}are connected in parallel. Their combined conductance will beWe know that conductance is reciprocal of resistance i.e. resistance = 1 / conductance. Lets resistances of the said conductors are R

_{1}, R_{2}and R_{3}. The resistance of their parallel combination will be, Therefore, conductance of the combination will be G_{1}+ G_{2}+ G_{3}.06․ Which of the following materials has highest electrical conductivity ?

Silver has the highest conductivity among all other materials used as an electrical conductor. Electrical conductivity measures materials ability to conduct a current. It is commonly represented by the Greek letter σ’ (sigma). Its SI unit is siemens per metre.

07․ The electrical conductivity of metal is typically of the order of (in ohm - m)

The electrical conductivity of metal is typically of the order of 10

^{7}ohm - m.08․ Pure metal generally have

Pure metal always have high conductivity as well as high temperature coefficient. The resistance of metal greatly varies with temperature.

09․ Poorest conductor of electricity is

Carbon is a non metal.

10․ Which variety of copper has the best conductivity ?

Pure annealed copper has best conductivity.

<<<2021222324>>>