A 50.0-mH inductor is connected in series with a 2500-? resistor in an ac circuit. What is the phase angle at 3000 Hz?
A) 90.0° B) -20.7° C) -75.9° D) 20.7° E) 75.9°
D
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A wire carrying a current that placed in a magnetic field will experience a maximum force if the angle between the direction of the current and the direction of the magnetic field is 60°
Indicate whether the statement is true or false
What lucky factor prevented the Chelyabinsk object from causing much damage at ground level?
A) It was made entirely of ices and thus exploded high in the air. B) It hit Earth at an oblique angle and thus exploded high in the air. C) A prototype asteroid defense system was being tested nearby.
A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
a. 0.090 mT. b. 0.36 mT. c. 23 mT. d. 36 mT. e. 45 mT.