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In given potentiometer,e.m.f of primary...

In given potentiometer,e.m.f of primary cell is `40V` and its internal resistance is `2Omega` resistance of wire `AB` is `4Omega` .In primary circuit,there is also a rheostat whose resistance varies as `R_(h)=(2x+2)Omega` .If balance length obtained for `x=0` is `l_(1)` and `x=2` is `l_(2)` respectively then find `(l_(1))/(l_(2))`

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