a. What is a Transformer? Explain its principle, constructive and mathematical relationship. b. How a 5mA, 100 ohms Galvanometer is converted into 20 V voltmeter? (R = 3900 Ω)

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a. What is a Transformer? Explain its principle, constructive and mathematical relationship. b. How a 5mA, 100 ohms Galvanometer is converted into 20 V voltmeter? (R = 3900 Ω)