- Compare the magnitude of the electrostatic and gravitational forces between…
- an electron and proton in a hydrogen atom (the radius of the electron's orbit is about 0.053 nm)
- two protons in a helium nucleus (the separation between them is about 1.2 fm)
- the Earth and the moon (the separation between them can be found in many references)
order of magnitude
e− and p+ in
p+ and p+ in
Earth and moon
- If the moon were held in its orbit by an electrostatic rather than gravitational force…
- What quantity of charge would be needed?
- How many elementary charges is this?
If all of the charge came from the separation of hydrogen atoms into electrons and protons…
- What mass of hydrogen would be required?
- How many liters of H2 gas at STP would be required?
- Given three charges in a standard coordinate system, calculate the magnitude and direction of the net electrostatic force on each.
- +10 μC at (+0 m, +0 m)
- −20 μC at (+0 m, +3 m)
- +25 μC at (−4 m, +0 m)
- Write something completely different.
- How does…
- the electrostatic force exerted by a proton on an electron compare to the electrostatic force exerted by an electron on a proton?
- the gravitational force exerted by a proton on an electron compare to the gravitational force exerted by an electron on a proton?
- If electric forces are so much more powerful than gravitational forces, why do we feel the Earth's gravitational force and not its electric force?