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An ammeter of resistance Ra is connected through a rheostat to a cell of negligible internal . When the rheostat is adjusted to a value R1, the...

An ammeter of resistance Ra is connected through a rheostat to a cell of negligible internal ... When the rheostat is adjusted to a value R1, the ammeter reads 0.75 of the full-scale value. When it is adjusted to a value R 2, the ammeter reads 0.25 of full-scale value. Compute the value of Ra in terms of R1 and R2.

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