When a ferromagnetic material that has been magnetized is brought to a temperature greater than the Curie temperature, what happens to its residual magnetism
a. Nothing happens to the residual magnetism.
b. The residual magnetism disappears.
c. The residual magnetism reaches it's highest value.
d. All the magnetic domains causing magnetism become a single domain.
e. The material of the magnet melts causing currents that are magnetic.
b
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A vector has components Ax < 0, and Ay > 0, the angle that this vector makes with the positive x-axis must be in the range
A) 0° to 90°. B) 90° to 180°. C) 180° to 270°. D) 270° to 360°.
In the normal eye the ciliary muscles that control the lens will relax
a. when viewing objects at the near point. b. when viewing objects at infinity. c. when viewing objects at a distance of 20 ft. d. only when a person has his/her eyes closed.
Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive
(?0 = 4? × 10-7 T ? m/A) A) 2.7 × 10-5 N repulsive B) 7.2 × 10-5 N repulsive C) 3.4 × 10-5 N attractive D) 2.7 × 10-5 N attractive E) 7.2 × 10-5 N attractive
In the context of the formation of planets in the solar nebula, the frost line marks the distance from the Sun beyond which
A) the temperature was low enough for hydrogen compounds to condense into ices. B) the temperature was low enough for solid rock to condense from the gas. C) hydrogen compounds were particularly abundant. D) planets could be cold enough to have snow.