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A 50 ohm galvanometer has full-scale current 5 mA. What shunt makes it read 1 A?
AAbout 0.25 ohm
BAbout 2.5 ohm
CAbout 25 ohm
DAbout 0.025 ohm
Answer & Solution
Correct answer: A. About 0.25 ohm
S = Ig G / (I - Ig) = 0.005 x 50 / 0.995, which is about 0.25 ohm.
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