MHT CET 2025 Physics question
The scale of a galvanometer is divided into 160 equal divisions. The galvanometer shows full scale deflection of 16 mA and maximum voltage is 80 mV. Now the range is changed so that galvanometer reads 160 V. The required resistance to be connected is
Answer: (A)
Solution
Full-scale current mA and the voltage across the galvanometer at full scale is 80 mV, so its resistance is . To measure up to V the instrument must act as a voltmeter, which needs a high resistance connected in series: I_g(G$+R)⇒
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