Suppose That the Moon Is Held in Its Orbit Around

question 8

Multiple Choice

Suppose that the Moon is held in its orbit around Earth by electrical forces rather than by gravitation. Given the gravitational constant G = 6.673 × 10^-11 N m²/kg², and that the mass of Earth is 5.98 × 10²⁴ kg, and the mass of the Moon is 7.35 × 10²² kg, what electrical charges, -Q on Earth and +Q on the Moon, are necessary to hold the Moon in a circular orbit?

• A)8.38 × 10¹² C
• B)5.71 × 10¹³ C
• C)7.02 × 10¹³ C
• D)1.19 × 10¹⁴ C

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