MHT CET 2024 Physics question

A galvanometer may be converted into ammeter or a voltmeter. In which of the following cases the resistance of the device so obtained will be the largest?

(A)Ammeter of range 1 A
(B)Ammeter of range 10 A
(C)Voltmeter of range 1 V
(D)Voltmeter of range 10 VCorrect

Answer: (D)

Solution

An ammeter is made by connecting a small shunt in parallel with the galvanometer, so its resistance is very small (and gets even smaller for a larger range). A voltmeter is made by connecting a large resistance in series, so its resistance is , which is large and proportional to

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Question ID VK-095437