Determine the ratio of the gravitational force to electrical force between an electron and a proton when separated by a distance r. Please include detailed solution. I will attach the reference formulas that we use. The value of k is 8.99 x 10^9, not rounded off to 9. Thank you!

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.