Classify the following statement as a characteristic
(a) of electric forces only,
(b) of magnetic forces only,
(c) of both electric and magnetic forces, or
(d) of neither electric nor magnetic forces.
The magnitude of the force depends on the charged object’s direction of motion.
1.electric forces
2.magnetic forces
3.both electric and magnetic forces
4.neither electric nor magnetic forces
2
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From a fracture mechanics viewpoint, the reason freshly drawn glass fibers are stronger than window glass is that window glass has _________ that decrease its strength.
Fill in the blank(s) with the appropriate word(s).
A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is
A) parallel to the field lines. B) perpendicular to the field lines. C) none of these
What can cause a galactic fountain?
A) winds and jets from newly-formed protostars B) a supernova occurring in the halo C) multiple supernovae occurring together D) the combined effect of spiral density waves E) molecular clouds falling towards the galactic center
If the absolute value of the magnification is equal to one, then the image is
A) larger than the object. B) the same size as the object. C) smaller than the object.