The power through a cylindrical resistor is 2.4 W. If the radius of this resistor is 3.8 mm, calculate the length of the resistor. The resistivity of this resistor is 6.2 x10-5 Ω.m, and the magnitude of the current density is 2.6 x105 A/m2.
a. 32.6 mm
b. 72.6 mm
c. 12.6 mm
d. 52.6 mm
P = 2.4 W
the current density is
Power is
the resistance is
Ans ===> c
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