The temp coefficient of resistence of tungsten is 4.5×10^{-3 }^° C^{-1 }and thats of germenium is -5×10^{-2 }^° C^{-1} . A tungsten of wire of resistence 100 ohm is connected in series with a germanium wire of resistence R. The value of R for which the resistence of combination does not change with temp is (1) 9 ohm (2) 1111 ohm (3) 0.9 ohm (4) 111.1 o

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