A potentiometer having the potential gradient of $$2$$ $$mV/cm$$ is used to measure the difference of potential across a resistance of $$10$$ ohm. If a length of $$50$$ cm of the potentiometer wire is required to get the null point, the current passing through the $$10$$ ohm resistor is (in$$ $$mA)

Question

Infinity Learn · Accepted Answer

$$V=xl$$ ⇒  iR $$=xl$$⇒   i × $$10$$ $$=$$ $$2$$ × $$10$$−$$310$$−$$2$$   × $$50$$ × $$10$$−$$2$$  $$=$$  $$0.1$$⇒   i × $$10$$   × $$10$$−$$3$$  $$A=10$$  mA

A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)

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