A certain fuse "blows" if the current in it exceeds 1.0 A, at which instant the fuse melts with a current density of 620 A/cm2. What is the diameter of the wire in the fuse?
A) 0.45 mm
B) 0.63 mm
C) 0.68 mm
D) 0.91 mm
A
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A white dwarf star is prevented from collapsing by
a. nuclear energy it is generating. b. its gravitational force. c. Hubble's law of extragalactic redshifts. d. degenerate electron gas pressure. e. degenerate astronomers observing the star.
The direction of a field line at a point in space shows the direction of the force that would act on a body placed at the point
Indicate whether the statement is true or false
The Dynamo Theory holds that:
A) lightning plays a major role in generating our magnetic fields. B) any other planet of similar density will also have a strong magnetic field. C) the Earth's core, like Mercury's, is now a solid, rigid bar magnet. D) magnetic fields are generated by rapidly spinning, fluid magnetic interiors. E) the Earth's magnetic field must switch polarities every few million years.
One major difference between Young's double slit interference experiment with light and Jonsson's similar experiment with electrons is that