8. (a) Explain how potentiometer can be used to compare the emfs
of two primary cells.
(b) In the potentiometer circuit shown, the balance (null) point is
at X.
(c) State with reason, where the balance point will be shifted
when (i) resistance R is increased, keeping all parameters
unchanged. (ii) resistance S is increased , keeping R constant
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Answer:
(i)R
AB
∝R
so If resistance R is increased keeping all other parameters same,null point X will be shifted towards forwards. inorder to increase R
AB
ii)R
AB
∝1/S
If resistance S is increased keeping R constant, balance point X shifts towards backwards. inorder to decrease R
AB
Explanation:
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