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The certification mark used to maintain ...

The certification mark used to maintain the standard of ghee and edible oilis -

A

1.AGMARK

B

2.ISI

C

3.BIS

D

4.FPO

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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?

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