Find the inductane of a unit length of a double line if the radius of each wire is `eta` times less than the distance between the axes of the wires. The field inside the wires is to be neglected, the permeability is assumed to be equal to unity throughout, and `eta gt gt 1`.

Inside a indinitely long circular cylinder cavity. The distance between the axes of the cylinder and the cavity is equal to a . Find the electric field strength E inside the cavity. The permittivity is assumed to eb equal to unity.

Find the self inductance of a unit length of a cable consisting of two thin walled coaxial metallic cylinders if the radius of the outside cylinder is eta (eta gt 1) times that of the inside one. The permeability of the medium between the cylinders is assumed to be equal to unity.

Find the inductance of a unit length of two parallel wires, each of radius a, whose centers are a distance d apart and carry equal currents in opposite direction. Neglect the flux within the wire.

Find the inductance of a unit length of two parallel wires, each of radius a, whose centers are a distance d apart and carry equal currents in opposite direction. Neglect the flux within the wire.

A long straight wire is located parallel to an infinite conducting plate. The wire is located parallel to an infinite conducting plate. The wire cross-sectional radius is equal to a , the distance between the axis of the wire and the plane equals b . FInd the mutual capacitance of this system per unit length of the wire under the condition a lt lt b .

Calculate the self inductance per unit length of a current loop formed by joining the ends of two long parallel wires of radius r separated by a distance d between their axes, neglecting the end effects and magnetic flux within the wires.

Two long and straight parallel wires are carrying current 1 A each. If the distance between the two wires be 1 m, what will be force acting per unit length on them?