Consider the image formed by a refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect will this have?
A) The top half of the image will be blacked out.
B) The lower half of the image will be blacked out.
C) The entire image will be blacked out, since the entire lens is needed to form an image.
D) The image will appear as it would if the objective were not blocked, but it will be dimmer.
E) There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.
D
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Which of the following statements describes a true observation that represents strong physical evidence that magnetic poles are not the same as electric charges? Select all answers that are both physically true and represent relevant evidence. (To select multiple answers using the back of the book, point to answers with multiple fingers.)
A. We describe magnetic poles as being north and south but charges as being positive or negative. B. A magnet does not exert force on a motionless charged particle, but another charged particle will. C. A magnet exerts force in a different direction on a motionless charged particle than a charged particle does. D. Magnetic fields are measured in teslas, but electric fields are measured in N/C. E. No one has seen an isolated magnetic pole. F. What do you mean? At the deepest level, electric charges and magnetic poles really are the same thing!
According to Newton, the closer gravitationally interacting objects are to each other, theA) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them
A) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them.
What inductance is needed in series with a 4.7-?F capacitor so the circuit will oscillate at a frequency of 10 kHz?
A) 21 ?H B) 54 ?H C) 4.7 mH D) 5.4 mH
Electromagnetic waves can be produced by
A) electric charges moving with constant velocity. B) electric charges at rest. C) electric charges in accelerated motion. D) All of the previous answers are correct. E) None of the previous answers is correct.