A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be

NEET 2012 Physics question

A milli voltmeter of milli volt range is to be converted into an ammeter of ampere range. The value (in ohm) of necessary shunt will be

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

At full-scale deflection the voltage across the milli-voltmeter is , and it is also the voltage across the shunt, which is connected in parallel with the galvanometer coil: . Total current ; the current through the shunt is i_g$ ≈

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Question ID VK-091287