Consider the potentiometer circuit arranged as in fig. The potentiometer wire is 600 cm long
A
At what distance from A should jockey touch the wire to get zero deflection in the galvanometer?
B
If the jockey touches the wire at a distance of 560 cm from A, what will be the current in the galvanometer? 
Text Solution
Verified by ExpertsThe correct answer is:
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Ans. Let the jockey divide the 600 cm length into two parts as shown below:
Let the jockey be placed at a distance of y cm from the left.
Therefore,
Since, 
, therefore, 560 cm will be equal to 14r. The diagram of the equivalent circuit is given below.
By solving the above equation we get the value of 
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