Q. 15.0( 4 Votes )

# A potentiometer w

Answer :

To find: the EMF of a primary cell 'e' which gives a balance point of 40 cm.

Resistance of potentiometer = R = 10 ohms

External battery has voltage = V = 6 V

Resistance in series = r = 5 ohms

Length of the potentiometer wire = L = 100

Equivalent resistance = R + r

Total current flowing through circuit = I

Using Ohm's law,

Let voltage potentiometer

Again using Ohm's law,

We know,

l = length across which e gives a balance point

Where k is the potential gradient

So,

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :

AB is a potentiomPhysics - Exemplar

What should be thHC Verma - Concepts of Physics Part 2

While doing an exPhysics - Exemplar

In a meter bridgePhysics - Exemplar