A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long
If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field near the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A) 16 mT
B) 4.9 mT
C) 15 mT
D) 6.0 mT
E) 9.0 mT
C
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An ideal transformer has 200 turns on its primary and 12 turns on its secondary. If the power input to the transformer is 120 kW, what is the power output?
A. 0.600 kW B. 7.20 kW C. 10.0 kW D. 120 kW E. 240 kW
The moon stopped evolving because it is too small to have kept its internal heat
Indicate whether the statement is true or false
The electric field around an isolated electron has a certain strength at a 1-cm distance from the electron. The electric field strength 2 cm from the electron is
A) half as much. B) the same. C) twice as much. D) four times as much. E) none of the above
The formations of rock hanging from the roofs of caves are called
A) moraines. B) stalactites. C) stalagmites. D) dikes.