Using wheatstone bridge principle;
2x=2100−x\frac{2}{x} = \frac{2}{100-x}x2=100−x2
2(100 - x) = 2 x xxx
200 = 2x+2xx + 2xx+2x
200 = 4x
x = 2004\frac{200}{4}4200
= 50cm
