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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)) andkl_(2)`\

B

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

C

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

D

`kl_(1) and kl_(2)`

Text Solution

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The correct Answer is:
B
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