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In the following circuit if key K is pressed then the galvanometer reading becomes half. The resistance of galvanometer is(a) 20 Ω (b) 30 Ω (c) 40 Ω (d) 50 Ω |
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Answer» Correct option (c) 40 Ω Explanation: Galvanometer reading becomes half means current distributes equally between galvanometer and resistance of 40 Ω. Hence galvanometer resistance must be 40 Ω. |
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