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Nuclei c acid s can als o serv e as coenzyme s or cofactor s in enzymati c or metaboli c reactions . Thes e cofactor s ar e compound s tha t ar e no t per manentl y associate d with an enzyme , bu t ar e necessar y for th e enzym e t o carr y ou t its biologica l function . Othe r nuclei c acids , messenge r ribonuclei c acid s (RNAs) , ar e used t o transfe r specific part s of th e geneti c informatio n in th e D N A t o th e site of protei n synthesis ; the y act as a templat e fro m whic h protein s ar e constructed .

Thi s exampl e illustrate s th e genera l pro cedur e for deducin g th e net resul t whe n a numbe r of electrica l force s ar e influencin g th e bod y of interest . Th e reade r shoul d thoroughl y understan d th e principle s involve d since the y will be use d agai n an d again . E L E C T R I C FIEL D In developin g th e formalis m t o describ e ho w an electri c charg e influence s its surroundings , physicist s hav e introduce d th e concep t of th e electri c field. Th e essence of thi s idea is tha t a charge d bod y perturb s all spac e aroun d it by th e ver y fact tha t it ha s a charge , an d tha t thi s perturbatio n of spac e is describe d by an electri c field.

Fo r thos e wh o ar e unfamilia r with vectors , Appendi x A is provide d t o cover som e of thei r mos t usefu l properties . Th e formula s given so far for Coulomb' s law hav e indicate d onl y th e strengt h of th e force , althoug h it wa s state d tha t th e directio n of a repulsiv e or attractiv e forc e betwee n tw o particle s lies on th e line connectin g th e tw o charges . Thi s the n define s th e directio n for th e forc e of interactio n betwee n onl y tw o electrica l bodies . Th e obviou s questio n no w is, Ho w doe s on e find th e resultan t forc e whe n a numbe r of charge s ar e involved ?

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