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a galvanometre has a resistance of G ohm and range of volt.calculate the resistance to be used in series with it to extend its range to v volt. ans= G(n-1). please explain in detail
Hey your question may have some error in it.If a galvanometer initially has a range of 0 to 1 volt with internal resistance G and if you want to increase the range to 0 to v volt,then this is the answer.You know that V=IROr,I=V/RCurrent I will remain fixed.Only V,R will change in this problem.Initially V=1 volt and R=G.SoI=1/G.Next V=v volt and R=G+r,where r is the added resistance.SoI=v/(G+r)Equate the two equations.1/G=v/(G+r)Or,vG=G+rOr,r=vG-GOr,r=G(v-1)Please approve the answer if you are helped.Feel free to ask if there is any further query.
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