▁of ▁the ▁need le ▁is ▁highest ▁when ▁its ▁field ▁is ▁in ▁the ▁same ▁direction ▁as ▁the ▁Earth ' s ▁magnetic ▁field . ▁Two ▁magnet s ▁will ▁have ▁potential ▁energy ▁in ▁relation ▁to ▁each ▁other ▁and ▁the ▁distance ▁between ▁them , ▁but ▁this ▁also ▁depends ▁on ▁their ▁orientation . ▁If ▁the ▁opposite ▁pol es ▁are ▁held ▁apart , ▁the ▁potential ▁energy ▁will ▁be ▁higher ▁the ▁further ▁they ▁are ▁apart ▁and ▁lower ▁the ▁closer ▁they ▁are . ▁Con vers ely , ▁like ▁pol es ▁will ▁have ▁the ▁highest ▁potential ▁energy ▁when ▁forced ▁together , ▁and ▁the ▁lowest ▁when ▁they ▁spring ▁apart . ▁ ▁N uc lear ▁potential ▁energy ▁N uc lear ▁potential ▁energy ▁is ▁the ▁potential ▁energy ▁of ▁the ▁particles ▁inside ▁an ▁atomic ▁nucle us . ▁The ▁nuclear ▁particles ▁are ▁bound ▁together ▁by ▁the ▁strong ▁nuclear ▁force . ▁We ak ▁nuclear ▁forces ▁provide ▁the ▁potential ▁energy ▁for ▁certain ▁kinds ▁of ▁radio active ▁decay , ▁such ▁as ▁beta ▁decay . ▁ ▁N uc lear ▁particles ▁like ▁pro tons ▁and ▁neut rons ▁are ▁not ▁destroyed ▁in ▁f ission ▁and ▁fusion ▁processes , ▁but ▁collections ▁of ▁them ▁can ▁have ▁less ▁mass ▁than ▁if ▁they ▁were ▁individually ▁free , ▁in ▁which ▁case ▁this ▁mass ▁difference ▁can ▁be ▁liber ated ▁as ▁heat ▁and ▁radiation ▁in ▁nuclear ▁re actions ▁( the ▁heat ▁and ▁radiation ▁have ▁the ▁missing ▁mass , ▁but ▁it ▁often ▁esc apes ▁from ▁the ▁system , ▁where ▁it ▁is ▁not ▁measured ). ▁The ▁energy ▁from ▁the ▁Sun ▁is ▁an ▁example ▁of ▁this ▁form ▁of ▁energy ▁conversion . ▁In ▁the