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Secondary Winding

61.To a galva...

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61.To a galvanometer of resistance 30 ohm a shunt is connected of resistance 30 ohm to make a ammeter of some range. What additional resistance should be connected with that shunt in series to just double the range of ammeter 1) 5 ohm 2) 15 ohm. 3) 30 ohm 4) 20 ohm

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