D8.12. Calculate the self-inductance of: (a)

3.5m

of coaxial cable with

a=

0.8mm

and

b=4mm

, filled with a material for which

\\\\mu _(r)=50;(b)

a toroidal coil of 500 turns, wound on a fiberglass form having a

2.5\\\\times 2.5cm

square cross section and an inner radius of

2cm;(c)

a solenoid having 500 turns about a cylindrical core of

2cm

radius in which

\\\\mu _(r)=50

for

0

and

\\\\mu _(r)=1

for

0.5

; the length of the solenoid is

50cm

.\ Ans.

56.3\\\\mu H;1.01mH;3.2mH

D8.12. Calculate the self-inductance of: (a) 3.5m of coaxial cable with a= 0.8mm and b=4mm, filled with a material for which r=50;(b) a toroidal coil of 500 turns, wound on a fiberglass form having a 2.52.5cm square cross section and an inner radius of 2cm;(c) a solenoid having 500 turns about a cylindrical core of 2cm radius in which r=50 for 0