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

What are solid core or multicore, What are Solid core or multicore? It ...

What are Solid core or multicore? It will depend on the use to that the optic is put and the actual installation conditions. Solid core optics has usually, a larger bending rad

Valve & digital electronics: thermionic emission, (i) The procedure of ejec...

(i) The procedure of ejection of electrons from a metal surface by the application of heat is known as thermionic emission and emitted electrons are known as thermions and current

Elliptical paths of celestial bodies, The project consists of a word proces...

The project consists of a word processed (typed) report submitted by the project report due date. Late submissions are penalized 10% of the mark per day, including Saturdays and Su

Spinning charges and an inhomogeneous magnetic field 1, Spinning Charges an...

Spinning Charges and an Inhomogeneous Magnetic Field 1 A spinning charged object passes by an inhomogeneous magnetic field. This animation is also used within a discussion of t

Calculate the current through the circuit, Q. In the given circuit, calcula...

Q. In the given circuit, calculate the current through the circuit and mention its direction. Let the current be I. 7 I + 3 I + 5I + 5 I = 10 + 8 - 2 (i.e) 20 I = 1

Explain prism, Prism: A transparent refractive device having of three r...

Prism: A transparent refractive device having of three rectangular and two refractive surfaces is known as prism. N = Sin (A + Dm) /2               Sin A/2 Where a is

Electric field intensity, If small test charge is taken as positive than w...

If small test charge is taken as positive than why measured value of electric intensity be somewhat less than the actual value of elctric intensity and vica versa

Optometry, I need to know the Physics of Laser operations on eyes. Please s...

I need to know the Physics of Laser operations on eyes. Please send examples as well.

Moving the bar magnet rapidly away from the loop, Question: A wire loop...

Question: A wire loop smears in a horizontal plane. Alongside the loop is a vertical bar magnet south end up. The bar magnet is divide by the plane of the loop. A person is shi

What is a monochromatic light, What is a monochromatic light? Ans: ...

What is a monochromatic light? Ans: Breaking the word down mono denotes one and chromatic means of colour so a fairly literal translation for the adjective monochromatic w

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