In a potentiometer experiment the balancing with  a cell is at length 240 cm. On shunting the cell with a resistance of  2\Omega the balancing length becomes 120 cm The internal resistance of the cell is

  • Option 1)

    4\Omega

  • Option 2)

    2\Omega

  • Option 3)

    1\Omega

  • Option 4)

    0.5\Omega

 

Answers (2)

As we learnt in

Determine the internal resistance -

r=(\frac{l_{1}-l_{2}}{l_{2}})R

r=(\frac{E}{V}-1)R

\frac{E}{V}=\frac{l_{1}}{l_{2}}

- wherein

 

 

 

The internal resistance of a cell is given  by

r= R\left ( \frac{l_{1}}{l_{2}} -1\right )= R\left ( \frac{l_{1}-l_{2}}{l_{2}}\right )

\therefore \: \: \: \: \: \: r= 2\left [ \frac{240-120}{120} \right ]= 2\Omega


Option 1)

4\Omega

This is incorrect.

Option 2)

2\Omega

This is correct.

Option 3)

1\Omega

This is incorrect.

Option 4)

0.5\Omega

This is incorrect.

Most Viewed Questions

Preparation Products

Knockout JEE Main April 2021 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 14000/- ₹ 4999/-
Buy Now
Knockout JEE Main May 2021

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 22999/- ₹ 9999/-
Buy Now
Test Series JEE Main May 2021

Unlimited Chapter Wise Tests, Unlimited Subject Wise Tests, Unlimited Full Mock Tests, Get Personalized Performance Analysis Report,.

₹ 6999/- ₹ 2999/-
Buy Now
Knockout JEE Main May 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 24999/-
Buy Now
JEE Main Rank Booster 2021

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 6999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions