If the frequency of the AC voltage across an inductor is doubled, the inductive reactance of that inductor
A) decreases to one-half its original value.
B) increases to twice its original value.
C) decreases to one-fourth its original value.
D) increases to 4 times its original value.
B
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An annular eclipse of the Sun occurs when the Moon doesn't quite cover the Sun in the zone of totality. This means that the Moon is
A) closer than usual to Earth. B) farther than usual from Earth. C) none of these
What class of material is the least expensive per unit volume that for certain has an elastic modulus of over 100 GPa?
(a) GFRP (b) Concrete (c) Cast iron (d) Steel
A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
A) 200 N B) 120 N C) 160 N D) 150 N E) 0 N
A long solenoid (n = 80 turns/cm) carries a current of 70 mA. Determine the magnitude of the magnetic field inside the solenoid