Consider the following statement regarding Kelvin Double

Solution

The Kelvin Double Bridge is a modified form of the Wheatstone bridge, specially designed to measure very low resistances (in the range of micro-ohms to a few ohms) with high accuracy, by eliminating the effect of lead and contact resistances. It is not used for high resistance measurements . ●      Statement (1): False → It is not meant for resistances up to mega-ohms; it is for very low resistances. ●      Statement (2): True → It gives high accuracy in measuring low resistance. ●      Statement (3): True → It is indeed a modification of the Wheatstone bridge.