In the sky, you see a red star and a blue star. which one is hotter? a. the red star
b. they are probably the same temperature
c. the blue star
d. the answer will depend on how far away the stars are

Option (C)

Explanation:

The color of a star plays a significant role in identifying its temperature and this colors observed are directly dependent on their surface temperature. Stars has the capacity to emit lights of different wavelength. These lights usually ranges from reddish to bluish in color. A star that appears to be red in color indicates a cool star, whereas a star that appears to be blue in color indicates a hot burning star.

The more cooler it is, the more reddish it appears and the more hotter it is, the more bluish it becomes.

Thus, the correct answer is option (C) i.e a blue star is more hotter.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it