If the electric potential at a point in space is zero, then the electric field at that point must also be zero
A) True
B) False
B
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A(n) _____ is a cluster of galaxy clusters
A) supercluster B) protocluster C) megacluster D) extrasolar cluster
Power: An ac series circuit has an impedance of 60 ? and a resistance of 30 ?. What is the power factor of this circuit?
A. 0.50 B. 0.71 C. 1.0 D. 1.4
The coils of a solenoid are stretched so that the length of the solenoid is twice its original length. Assuming the same current is passed though the solenoid before and after it is stretched, how does the magnetic field inside the solenoid change, if at all, as a result of the stretching?
a) The magnetic field after the stretching is one-fourth the value it was before stretching. b) The magnetic field after the stretching is one-half the value it was before stretching. c) The magnetic field after the stretching is the same as the value it was before stretching. d) The magnetic field after the stretching is twice the value it was before stretching e) The magnetic field after the stretching is four times the value it was before stretching.
The imaginary, huge, apparently moving sphere on which the stars appear to be mounted is called the _______________ sphere
a. celestial b. global c. universal d. galactic