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CBSE Class 12-science Answered

A galvanometer needs 50mV for full scale deflection of 50 divisions.find it's voltage sensitivity.whatmust be the galvanometer resistance if it's current sensitivity is 1 Div/A
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Asked by monutripathi145 | 15 Jan, 2021, 04:47: PM
answered-by-expert Expert Answer
Voltage senstivity = number of divisions / full scale voltage  = 50 divisions / 50 mV = 1 division / 1 mV 
 
Current sensitivity = 1 division/ 1 A 
 
If galvanometer has 50 divisions , then full scale current = 50 A
 
when 50A passes through galvanometer , we should get 50 mV voltage drop across shunt resistance R
 
Hence , we have 50 × R = 50 × 10-3 V    or   R = 0.001 Ω
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