The maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is
A) 0°.
B) 45°.
C) 90°.
D) 135°.
A
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Measured ages of globular clusters suggests that the Universe is about
a. 1.4 billion years old. b. 14 billion years old. c. 140 billion years old.
The vibrations of the Sun reveal information about:
A) the temperature of the core of the Sun. B) the structure of the atmosphere of the Sun. C) the interior structure of the Sun. D) the production of energy in the Sun. E) the magnetic field of the Sun.
Because a white dwarf is no longer burning fuel, it is more accurately described as being a
A) stellar remnant. B) failed star. C) protostar. D) black elf.
Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of either of the outer wires?
a. 1.0 mN b. 0.50 mN c. 1.1 mN d. 1.5 mN e. 2.0 mN