A cable consisting of a wire 3 mm in diameter and insulated with 3 mm thick dielectric of relative permittivity 4.5 is placed in water. Calculate the capacitance of 1 km length of the cable.

A cable consisting of a wire 3 mm thick dielectric of relative permitively 10. Calculate the capacitance of 1 km length of the cable.

A cubic cm of gold is drawn into a wire 0.1 mm in diameter, find the length of the wire.

1 cm^(3) of gold is drawn into a wire 0.1 mm in diameter. Find the length of the wire.

A capacitor is composed of two plates separated by a sheet of insulating material 13 mm thick and or relative permittivity 4. The distance between the plates is increased to allow the insertion of second sheet 5 mm thick and of relative permittivity in_(r) . If the capacitance of the capacitor so formed is 1/3 of the original capacitance , find in_(r) .

The capacitance of a parallel plate condenser is C_(0) If a dielectric of relative permittivity epsilon_(r) and thickness equal to one fourth the plate separation is placed between the plates, then its capacity becomes C. The value of (C)/(C_(0)) will be -

The cross section of a cable is shown in fig. The inner conductor has a radius of 10 mm and the dielectric has a thickness of 5 mm . The cable is 8 km . Long. Then the capacitance of the cable is [log_(e) 1.5 =0.4] . .

A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in the interior.The diameter of the pencil is 7mm and the diameter of the graphite is 1mm. If the length of the pencil is 14cm, find the volume of the wood and that of the graphite.

A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in the interiro .The diameter of the pencil is 7 mm and the diameter of the graphite is 1 mm . If length of the pencil is 10 cm, find the voluem of the wood and that of the graphite.