A potentiometer wire PQ of $$1$$ m length is connected to a standard cell $$E1$$. Another cell $$E2$$ of emf $$1.02$$ V is connected with a resistance ‘r’ and switch S (as$$ shown in $$figure). With switch S open, the null position is obtained at a distance of $$49$$ cm from Q. The potential gradient in the potentiometer wire is:

Question

A potentiometer wire PQ of $$1$$ m length is connected to a standard cell $$E1$$. Another cell $$E2$$ of emf $$1.02$$ V is connected with a resistance ‘r’ and switch S (as$$ shown in $$figure). With switch S open, the null position is obtained at a distance of $$49$$ cm from Q. The potential gradient in the potentiometer wire is:

Infinity Learn · Accepted Answer

As switch S is open→  Under balancing condition, no current flows through secondary circuit.So  $$VPJ=E2(Pot$$. $$gradient)$$ $$=E2lPJ(Pot$$. $$gradient)$$  $$=1.020.51Vcm=0.02Vcm$$

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material