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JEE Advanced2014PhysicsMagnetic Effects of CurrentActual

A galvanometer gives full scale deflection with 0 · 006 A current. By connecting it to a 4990 Ω resistance, it can be converted into a voltmeter of range 0 - 30 V . If connected to a 2 n 249 Ω resistance, it becomes an ammeter of range 0 - 1 · 5 A . The value of n is

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0

Step-by-step solution

Given a galvanometer of resistance (of resistance R G ) get converted into a voltmeter of range 0 - 30 V , when a resistance of R S = 4990 Ω is connected in series of it and give full scale of deflection with current I G = 0 · 006 A . Than from equation I G = V R S + R G 0.006 = 30 4990 + G ⇒ R G = 10 Ω Now this galvanometer is connected with a shunt resistance to convert into ammeter of range 0 - 1 · 5 A Given I G = 0.006 , so current passing shunt will be I S = I - I G = 1 . 5 - 0 · 006 = 1.494 A Since R G and R

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