Question

Find the quantity of heat evolved every second in
a unit volume of a copper conductor with a current
density of 30 A/cm². (p = 2 x 10 power-8 Om)
(1) 1800 W/m
(2) 600 W/m
(3) 300 W/m
(4) 150 W/m​

Answer 1

Answer:

4 th is the and of the given question

Answer 2

Answer:

The correct option to the question"-Find the quantity of heat evolved every second in a unit volume of a copper conductor with a current density of 30 A/cm². (p = 2 x 10 power-8 Om)"is-

(1) 1800 W/m

Explanation:

The quantity of heat evolved every second in a unit volume of a copper conductor with a current density of 30 A/cm². (p = 2 x 10 power-8 Om) Is-

As we know, H =Pt = I²Rt

H = I²ρ Lt /A V = LA =Volume

L = V / A H = I²ρVt/A

J = I/AH = JVt

H = J²ρVt

given t = 1 sec V = 1 metr cube J = 30/10-⁴ A/m² ρ

copper= 2 x 10-⁴Wm² H = 900 * 10-⁸ * 2 * 10-⁸ = 1800 W/ meter cube