A balanced Wheatsone bridge ABCD has the following arm resistances :

R_AB = 1 k$$\Omega$$ $$\pm$$ 2.1%; R_BC = 100 $$\Omega$$ $$\pm$$ 0.5%; R_CD is an unknown resistance; R_DA = 300 $$\Omega$$ $$\pm$$ 0.4%. The value of R_CD and its accuracy is

When the Wheatstone bridge shown in the figure is used to find the value of resistor $${R_x},$$ the galvanometer $$G$$ indicates zero current when $${R_1} = 50\,\Omega ,\,\,{R_2} = 65\,\Omega $$ and $$\,{R_3} = 100\,\Omega ,\,\,$$ If $${R_3}$$ is known with $$\, \pm 5\% \,$$ tolerance on its nominal value of $$100\,\Omega .$$ What is the range of $${R_x}$$ in Ohms?

The bridge method commonly used for finding mutual inductance is