At double the distance from a long current-carrying wire, the strength of the magnetic field produced by that wire decreases to
A) 1/8 of its original value.
B) 1/4 of its original value.
C) 1/2 of its original value.
D) 1/ of its original value.
E) /3 of its original value.
C
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A totally eclipsed Moon glows coppery red because
a. the Moon's surface is made of iron ore which is red in color. b. red light is cooler than blue light. c. during a lunar eclipse the Sun is cooler than normal and its light is more red. d. only red light is able to pass completely through Earth's atmosphere and reach the Moon. e. the Moon appears red during a total solar eclipse, not a total lunar eclipse.
A beam of electrons can be deflected by a
A) magnetic field. B) electric field. C) both of these D) neither of these
A 5.0 ?F and a 7.0 ?F capacitor are connected in series across an 8.0-V DC source. What is the voltage across the 5.0 ?F capacitor?
A) 0 V B) 8.0 V C) 2.7 V D) 3.6 V E) 4.7 V
The number of protons in a nucleus is the __________ number
Fill in the blank(s) with correct word