Electric dipoles always consist of two charges that are
A)
equal in magnitude; opposite in sign.
B)
equal in magnitude; both are negative.
C)
equal in magnitude; both are positive.
D)
unequal in magnitude; opposite in sign.
E)
unequal in magnitude; both are negative.
A
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a. 0 pc b. 1 pc c. 10 pc d. 100 pc
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
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