Two electrons are a certain distance apart from one another. What is the order of magnitude of the ratio
of the electric force between them to the gravitational force between them?

Question

Two electrons are a certain distance apart from one another. What is the order of magnitude of the ratio of the electric force between them to the gravitational force between them?

TestHub · Accepted Answer

F e ​ = k r 2 q 1 ​ q 2 ​ ​ = 9 × 1 0 9 × r 2 ( 1.6 × 1 0 − 19 ) 2 ​ ≈ 9 × 1.6 × 1.6 × r 2 1 0 − 29 ​ F g ​ = G r 2 m 1 ​ m 2 ​ ​ = 6.7 × 1 0 − 11 × r 2 ( 9.1 × 1 0 − 31 ) 2 ​ ≈ 6.7 × 9.1 × 9.1 × r 2 1 0 − 73 ​ F g ​ F e ​ ​ ≈ 1 0 42

Physics - Gravitation Question with Solution | TestHub

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