The resistivity of gold is 2.44x10^-8 ohm.m at room temperature. A gold wire tha

Question

The resistivity of gold is 2.44x10^-8 ohm.m at room temperature. A gold wire that is 1.4 mm in diameter and 16 cm long carries a current of 250 mA. What is the electric held in the wire? Select one: What length of a certain metal wire of diameter 0.15 mm is needed for the wire to have a resistance of 15 ohm? The resistivity of this metal is 1.68 x 10^-8 ohm.m. Select one: As shown in the figure, a wire is bent into the shape of a tightly closed omega (ohm), with a circular loop of radius 4.0 cm and two long straight sections. The loop is in the xy-plane, with the center at the origin. The straight sections are parallel to the x-axis. The wire carries a 5.0-A current, as shown. What is the magnitude of the magnetic field at the center of the loop? Select one: The y component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Ey = (375 V/m) cos[kx - (2.20 x 10^14 rad/s) t]. What is the wavelength of this electromagnetic wave? Select one:

Explanation / Answer

#27:

Note that

R = rho (L) / A

--> L = R A / rho

As A = pi r^2 = 1.767E-8 m^2

Then

L = 16 m   [ANSWER]

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