Which of the following universal forces is the weakest?  A) electric B) gravitational C) magnetic D) strong nuclear I also need some explanation for this one 

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Well, electric and magnetic are actually the same in nature (as basic force in the Universe). The four, in decreasing order of strength, are: Strong nuclear, Weak nuclear, Electric/Magnetic (in roughly the same range) and Gravitational (much weaker than Electric/Magnetic -- a magnet less than 1 kg beats Earth which is quite a lot of gigatons, roughly)

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