Rank the following charge/distance combinations from lowest energy to highest en

Question

Rank the following charge/distance combinations from lowest energy to highest energy. Your answer should be a four letter "word" made up of the letters a, b, c and d. For example, if you think the order is a (lowest energy), then b, then c, then d (highest energy), you should enter the "word" abcd in the answer box. Note, the word has no spaces or commas.

a) A -2 charge and a -3 charge separated by 2 units of distance
b) A +4 charge and a +1 charge separated by 2 units of distance
c) A +3 charge and a -2 charge separated by 2 units of distance
d) A -2 charge and a +4 charge separated by 2 units of distance

Explanation / Answer

We know the formula,

Energy = (Qa X Qb)/distance
applying the same formula
a) Energy = (-2 X -3)/2 = 6/2 = 3

b) Energy = (4 X 1)/2 = 2

c) Energy = (3 X -2)/2 = -6/2 =-3

d) Energy = (-2 X 4)/2 = -8/2 =-4
order will be dcba

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