Two Electrons Are Separated by One Cm

question 9

Multiple Choice

Two electrons are separated by one cm. What is the ratio of the electric force to the gravitational force between them? (m_e = 9.11*10 ^{- 31} kg, k_e = 8.99 * 10⁹ N.m²/C², G = 6.67 * 10^-11 N.m²/kg², and e = 1.6 *10 ^{- 19} C)

• A) 1.3 *10²⁰
• B) 4.2 *10⁴²
• C) 2.3 *10²
• D) 3.1 * 10²²