CalculatResistance of the coil is 20Ω whose diameter is 1mm and resistivity of material of the
wire is 25µΩm. Calculate length of the wire requirede length of the wire required
Answers
Answer:
an electronic machine that can store, find and arrange information, calculate amounts and control other machines
Answer:
The resistance of the wire is expressed as R=
A
ρL
where,
rho is the resistivity of the wire,
L is the length of the wire,
A is the area of coss section of the wire.
It is given that the radius of the wire is 1 mm, that is 0.001 m. Therefore the area of cross section is given as πr
2
=3.14×0.001
2
=3.14×10
−6
.
Hence, the resistance of the wire when the resistance is 1 ohm, radius is 1mm, that is 0.001m and resistivity is 1.7\times { 10 }^{ -8 }\quad ohm-meter is expressed as 1=
3.14×10
−6
1.7×10
−8
×L
.
So the length L is derived as follows,
L=
1.7×10
−8
1×3.14×10
−6
=
1.7×10
−8
3.14×10
−6
=1.847×10
−2
.
Hence, the length of the wire is 184.7 meters.