Physics
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A0.2 cm diameter wire must carry a 20-a current. if the maximum power dissipation
A0.2 cm diameter wire must carry a 20-a current. if the maximum power dissipation along the wire is 4w/m, what is the minimum allowable conductivity of the wire in ohm-m? (a) 3.18x10 (b) 3.18x10 () 3.18x10 (d) 3.18x10
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Apple557
4,4(73 marks)
The conductivity of the wire is 
.
Explanation:
Given that,
Diameter = 0.2 cm
Current = 20 A
Power = 4 W/m
We need to calculate the conductivity
We know that,
Using formula of resistance
....(I)
Where,
= resistivity
A = area
l = length
Using formula of power
Put the value of R in equation (I)
Put the all values into the formula
Hence, The conductivity of the wire is .
betsylancer8522
4,4(81 marks)
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