We have that the values for F north,
F east,
F up are
From the Question we are told that
electric force 
electric force , 
electric force , 
charge on this ball one 
charge on this ball two 
Generally the equation for the F north is mathematically given as


For F East


For F UP


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A.
According to the equation: v=λ*f
λ stands for wavelength. wavelength increases, the frequency will decrease. lower frequency deserves low energy.
A bridge supported by vertical cables which then leads to more support from larger cables.