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A potentiometer circuit is set up as sho...

A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0A when two way key is switched off. The balance points , when the key between the terminals (a) 1 and 2 (b) 1 and 3 , is plugged in, are found to be at length `l_(1)cm " and " l_(2)` cm respectively. The magnitudes, of the resistors R and X in ohm, are then equal, respectively to

A

`k(l_(2)-l_(1))"and"kl_(2)`

B

`kl_(1)"and"k(l_(2)-l_(1))`

C

`k(l_(2)-l_(1))"and"kl_(2)`

D

`kl_(1)"and"kl_(2)`

Text Solution

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The correct Answer is:
B
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