The magnetic field inside a current-carrying coil increases when
A) current is increased.
B) the number of loops of wire in the coil increases.
C) an iron core is inserted.
D) all of the above
E) none of the above
Answer: D
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Evidence to support the fact that Earth's central core is solid can be attributed to
A) a decrease in S-wave velocity as they encounter and move through the inner core. B) an increase in P-wave velocity as they encounter and move through the inner core. C) a decrease in P-wave velocity as they encounter and move through the inner core. D) an increase in S-wave velocity as they encounter and move through the inner core.
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a. True b. False Indicate whether the statement is true or false
A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg
What is the tension force that the lifting cable exerts on the submarine (a) when the submarine is submerged in water of density 1000 kg/m3, and (b) when it is entirely out of the water? A) (a) 2.0 × 105 N (b) 1.7 × 105 N B) (a) 1.7 × 105 N (b) 2.0 × 105 N C) (a) 2.6 × 103 N (b) 2.0 × 105 N D) (a) 2.0 × 105 N (b) 2.6 × 103 N