In the ohmmeter in below Fig.M is a 2.50-mA meter of
Chapter 26, Problem 39E(choose chapter or problem)
In the ohmmeter in below Fig.M is a 2.50-mA meter of resistance 65.0 ?. (A 2.50-mA meter deflects full scale when the current through it is 2.50 m A.) The battery ?B? has an emf of 1.52 V and negligible internal resistance. ?R? is chosen so that when the terminals ?a? and ?b? are shorted (?Rx? = 0), the meter reads full scale. When ?a? and ?b? are open [?Rx? = ?], the meter reads zero. (a) What is the resistance of the resistor ?R?? (b) What current indicates a resistance ?Rx? of 200?? (c) What values of ?Rx? correspond to meter defections of ¼, ½ and ¾ of full scale if the deflection is proportional to the current through the galvanometer? Figure:
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