B should be the answer
Look at this example to help you
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A: 2 concrete blocks 6cm apart will have the least gravitational attraction to each other.
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Answer:
0.027 J
Explanation:
The formula of the potential energy in electrostatic (U) is

The values given in the question are
Charge : q = 
Electric Field strength : E = 
Distance : d is 0.030 m
Insert in the formula , will give us

Further solving it

Which is the required answer.
Thanks
Amplitude is the pair of vertical buttons, so to speak. Compressions are the bunched up vertical lines with the purple arrows pointing left and right. Rarefactions are purple arrows pointing down. Wavelength is crest to crest purple buttons. Associated LH and RH pointing arrows.
Answer:
B
Explanation:
The correct answer is B) have unlike charges. Since they are attracted to each other they have to be unlike