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The figure shows a metre-bridge circuit, with AB = 100 cm, X = 12 Ω and R = 18 Ω, and the jockey J in the position of balance. If R is now made 8 Ω, through what distance will J have to be moved to obtain balance? (a) 10 cm (b) 20 cm (c) 30 cm (d) 40 cm |
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Answer» Correct Answer is: (b) 20 cm X/R = AJ/JB for balance Initially, 12/18 = AJ/100 - AJ' finally 12/8 = AJ'/100 - AJ or AJ' - AJ = 20 cm. |
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