Niobium metal becomes a superconductor (with electrical resistance equal to zero) when cooled below 9.00 K. If superconductivity is destroyed when the surface magnetic field exceeds 0.100 T, determine the maximum current a 5.31-mm-diameter niobium wire can carry and remain superconducting. (µ0 = 4? × 10^?7 T?m/A)
a. 2660 A
b. 423 A
c. 211 A
d. 1330 A
e. 4170 A
d
You might also like to view...
An electrically charged atom is an
A) ion. B) isotope. C) both of these D) neither of these
Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. Of the two, the planet that is farther from the star must have
a. the smaller period. b. the greater period. c. the smaller gravitational mass. d. the larger gravitational mass. e. the larger universal gravitational constant.
A particle moving along the x axis has a position given by x = (24t – 2.0t3) m, where t is measured in s. What is the magnitude of the acceleration of the particle at the instant when its velocity is zero?
a. 24 m/s2 b. zero c. 12 m/s2 d. 48 m/s2 e. 36 m/s2
Rising air expands and cools. The rate of cooling depends on
A) the air's moisture content. B) the dry adiabatic lapse rate. C) the energy of the water-vapor molecules. D) temperature inversions.