Physics, 20.09.2019 03:00 bronkosarecool

Force f acts between two charges, q1 and q2, separated by a distance d.
if q1 is increased to twice its original value and the distance between the charges is also doubled, what is the new force acting between the charges in terms of f?
1/4 f
1/2 f
f
2f

Answers: 1

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The electrostatic force is proportional to the product of the charges and inversely proportional to the square of the distance that separates the charges.

This is, F = K *Q1 * Q2 / (d^2)

Now, Q1' = 2 * Q1 and d' = 2d

Then F' = K*Q*Q2 / (2d)^2 = K*2Q1*Q2 / 4 (d^2) = 2F / 4 = F/2 = (1/2)F

Then, the answer is the second option of the list. (1/2)F

Answer from: Quest

An atom (ours, not carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by mathematical calculations before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of uranus led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

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Force f acts between two charges, q1 and q2, separated by a distance d.
if q1 is increased to...