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Very high or very low resistance cannot ...

Very high or very low resistance cannot be measured correctly by using the Wheatstone bridge principle Give reason .

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A very low resistance cannot be measured with a wheatstone bridge . Why ?

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Statement I : If the resistance of the first two arms P and Q of a balanced Wheatstone bridge are exchanged , the balanced condition is not disturbed . Statement II : The balanced condition of a Wheatstone bridge is independent of the resistance of the galvanometer used .

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Fig. shows a potentiometer with a cell of 2.0V and internal resistance 0.40Omega maintaining a potential drop across the resistor wire AB. A standard cell which maintains a constant emf of 1.02V (for very moderate currents upto a few pA) gives a balance point at 67.3 cm length of the wire. Io ensure very low currents drawn from the standard cell, a very high resistance of 600kOmega is put in series with it which is shorted close to the balance point. The standard cell is then, replaced by a cell of unknown emf e and the balance point found similarly turns out to be at 82.3 cm length of the wire, What purpose does the high resistance of 600kOmega have?