Potentiometer, Physics

Assignment Help:

The emf of the driver cell of a potentiometer is 2V & its internal resistance is negligible . The length of the potentiometer wire is 100cm & resistance is 5 ohm.How much resistance is to be connected in series with the potentiometer wire to have a potential gradient of 0.05V/cm?
 
Solution) Potential gradient K= 0.05 V/cm = 5V/m
Driver cell emf E=2V
Resistance of potentiometer wire R1= 5Ω/m
Series resistance, Rs= ?

Now, to have K=5V/m, current flowing through the wire must be 1 Ampere (  since current I= 5V/5Ω=1A)
So, for the driver cell of emf 2V to generate 1A of current, series resistance ro be connected is 2Ω( since Rs= E/I=2/1=2Ω)

Therefore, Rs=2Ω


Related Discussions:- Potentiometer

Experiment a model elevator, A model elevator A working model of an ele...

A model elevator A working model of an elevator can simply be made from easy materials. For the rotating drums or sheaves, metal coffee tin will do. With a hammer and a big nai

Spectrum, Show that the spectrum of thermal radiation for T ¼ 300K peaks at...

Show that the spectrum of thermal radiation for T ¼ 300K peaks at approximately 10 microns Minimum 100 words accepted

Making a simple refracting telescope, Making a simple refracting telescope ...

Making a simple refracting telescope  To make a simple telescope, two cardboard tubes will be needed, one fitting inside the other.  It is not possible to make a satisfactory t

Conservation of momentum, In a pool game a .17kg cue ball traveling at .75 ...

In a pool game a .17kg cue ball traveling at .75 m/s in the plus x direction hits a stationary eight ball. The eight ball moves off with velocity of .25 m/s at an angle of 37 degre

#titlemultihance in mri and mra.., #how does multihance work in mra and how...

#how does multihance work in mra and how does it improve mri image quality?question..

Evaluate the electric field, Question: Is it probable for the electric...

Question: Is it probable for the electric field to be zero in a region of space where the electric potential is not zero? Answer: Only if the electric potential has on

What is curvilinear motion, What is curvilinear motion? Basically, it's...

What is curvilinear motion? Basically, it's any motion that's produced or bounded by curved -- as opposed to straight -- lines. In high school, curvilinear motion is usually

Calculate depth of the water, A circular hole of radius r at the bottom of ...

A circular hole of radius r at the bottom of an initially full water container is sealed by a ball of mass m and radius R (>r). The depth of the water is now slowly decr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd