A magnetic field will be produced at a point in space if an electric field at that point
a. exists.
b. gets stronger.
c. gets weaker.
d. changes direction.
e. all of the above
b, c, d
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What are the two most important intrinsic properties used to classify stars?
A) Mass and age B) Luminosity and surface temperature C) Distance and luminosity D) Distance and surface temperature E) Distance and color
A 2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kN. What is the frequency of the fundamental mode?
A) 204 Hz B) 102 Hz C) 408 Hz D) 510 Hz E) 153 Hz
When the momentum of a punch is stopped by the fighter's jaw, he "rides with the punch" so as to
1) decrease the velocity of the blow, 2) increase the time of contact of the blow, and thereby reduce the 3) force. 4) impulse. 5) momentum. 6) energy.
Historically, the earliest atomic model to explain electrical phenomena was
A) the quantum model. B) the planetary model. C) the Hollywood model. D) the Greek model. E) Galileo's model.