A fifteen turn rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T,
the other two sides being perpendicular to the magnetic field.
(a) The torque on the loop is
(b) The magnetic moment of this coil is
(a) 0.028 m?N.
(b) 0.75 A?m2.
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Earth's magnetic field is generated in the iron-rich mantle
a. True b. False Indicate whether the statement is true or false
A string with a length of 1.20 m has a mass of 4.00 gm. The velocity of wave propagation along the string is 185 m/s. The tension of the stretched string is
A. 162 N. B. 145 N. C. 130 N. D. 114 N. E. 102 N.
The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits its star more than a factor of ten closer than Mercury's orbit around the Sun. Which is the most plausible explanation for its large size?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. B) Planets that are close to a star are hotter, causing them to puff up. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed under their own gravity.
The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars that have no ongoing nuclear fusion?
A) a B) b C) c D) d E) e