DEPARTMENT OF PHYSICS INDIAN INSTITUTE OF TECHNOLOGY MADRAS PH102 Physics II
Problem Set 8 To be discussed on April 2 2007
~ = E ~,B ~ = µH ~ , J~f = σ E ~ (Ohm’s Law). For a metal under 1. The skin effect: Recall the relations D ~ normal circumstances, J~f is much larger than ∂ D/∂t. ~ satisfies the equation (a) Neglect ρf and show that for a metal, E ~ = µσ ∇2 E
~ ∂E . ∂t
~ =E ~ 0 exp (ikz − ωt) , for z > 0. (b) Consider a “plane wave” solution of the above equation of the form E Find the allowed values of the wave number k as a function of the frequency ω. (c) Interpret the form of the solution. How does the amplitude of the electric field vary with k, and at what distance does it decay to 1/e of its value at z = 0? 2. An ideal parallel plate capacitor of capacitance C has circular plates located at z = 0 and z = d respectively. The medium between the plates is a linear, homogeneous, isotropic dielectric of dielectric constant κ. The capacitor is connected to a resistance R in series, and a voltage V is applied to the circuit. The charge q on the capacitor plates increases with time according to q = C V (1 − e− t/R C ). Find the magnitude of the magnetic field H inside the dielectric. 3. An infinitely long straight non-magnetic conductor with a circular cross-section of radius a carries a steady current I. The current is distributed uniformly over the cross-section of the wire. The conductivity of the wire is σ. Find the rate at which energy flows into unit length of the conductor. ~ 4. A point charge q moves in free space with constant velocity ~v . Using the Maxwell equation for curl H, ~ obtain H at a point P whose position vector relative to the instantaneous position of the charge is given by ~r. 5. A beam of protons has a circular cross-section. Each proton has a velocity ~v , and the beam constitutes a ~ outside the beam, at a distance r current I. Find the direction and magnitude of the Poynting vector S from the axis of the beam.
DEPARTMENT OF PHYSICS INDIAN INSTITUTE OF TECHNOLOGY ...
INDIAN INSTITUTE OF TECHNOLOGY MADRAS. PH102 Physics II. Problem Set 8. To be discussed on April 2 2007. 1. The skin effect: Recall the relations D ...
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