Question
Physics Question on coulombs law
The ratio of magnitude of electrostatic force and gravitational force for an electron and a proton is
A
6.6×1039
B
2.4×1039
C
6.6×1029
D
2.4×1029
Answer
2.4×1039
Explanation
Solution
Here, for an electron and a proton Electrostatic force, ∣Fe∣=4πε01r2e2 Gravitational force, ∣Fg∣=r2Gmemp ∴∣Fg∣∣Fe∣=4πε01Gmempe2 =6.67×10−11×9×10−31×1.66×10−279×109×(1.6×10−19)2 =2.4×1039