A) Increase
B) Decrease
C) Initially decrease and then increase
D) Initially increase and then decrease
Correct Answer: C
Solution :
[c] The total current supplied by source is \[{{I}_{0}}=\frac{{{V}_{0}}}{(R-x)+\frac{rx}{r+x}}\] where x is resistance part of the potentiometer between point a and the sliding contact appearing in parallel with R. Then the current through ammeter \[={{I}_{0}}\times \frac{r}{r+x}\] This current is \[\frac{{{V}_{0}}}{R}\]when \[x=0\]& also when \[x=R.\]You need to login to perform this action.
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