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A nichrome wire AB, 100 cm long and of uniform cross section is mounted on a meter scale, the points and B coinciding with 0 cm and 100 cm marks respectively. The wire has a resistance S = 50 ohm. Any point
C along this wire, between A and B is called a variable point to which one end of an electrical element connected. In the following questions this arrangement will be referred to as ‘wire AB’.
In the adjacent circuit arrangement it is found that deflection in the galvanometer is 10 divisions. Also the voltage across the ‘wire AB’ is equal to that across the galvanometer. Therefore, the current sensitivity of the galvanometer is about
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