Question

A copper sphere diameter is 7.8cm is to be dawn in to wire of diameter is 4mm.find the length of the wire

Answer 1

What is the characteristic impedance of a coaxial cable using a solid polyethylene dielectric having a relative permeability of 2.3, an inner conductor of 1 mm diameter and an outer conductor of diameter 5mm?
a. 63.4 ohms b. 63.5 ohms c. 63.6 ohms d. 63.7 ohms

Answer 2

Answer:

1cm = 10mm

1 mm = 1/10cm thus 4mm = 0.4cm

ATQ

volume of sphere

= volume of copper wire i.e. in shape of cylinder.

4/3 π r³ = π r'² h. here h be the length

4/3 x 3.9 x 3.9 x 3.9 = 0.2 x 0.2 x h

so h= 1977.5cm..

this implies the length of the wire is 1977.5cm

hope this will help you