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A galvanometer may be converted into ammeter or voltmeter. In which of the following cases the resistance of the device will be largest? (Assume the maximum range of galvanometer to be 1 mA)

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An ammeter of range 10 A

A voltmeter of range 5 A

An ammeter of range 5 A

A voltmeter of range 10 V

answer is D.

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Detailed Solution

With these diagrams, we can easily find that the maximum equivalent resistance will be across voltmeter of range 10 V

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