The length of a potentiometer wire is 1m...

The length of a potentiometer wire is 1m and its resistance is `4Omega` A current of 5 mA is flowing in it. An unknown source of emf is balanced on 40 cm length of this wire, then find the emf of the source.

`20Omega`

`40Omega`

`60Omega`

`80Omega`

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

NTA NEET SET 46
NTA MOCK TESTS|Exercise PHYSICS|90 Videos
NTA NEET SET 48
NTA MOCK TESTS|Exercise PHYSICS|44 Videos

Similar Questions

Explore conceptually related problems

The length of the potentiometer wire is 600 cm and a current of 40 mA is flowing in it. When a cell of emf 2 V and internal resistance 10Omega is balanced on this potentiometer the balance length is found to be 500 cm. The resistance of potentiometer wire will be

A potentiometer wire has resistance of per unit length of 0.1Omega//m . A cell of e.m.f. 1.5V balances against 300cm length of the wire. Find the current in the potentiometer wire.

In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10Omega is connected in parallel with the battery then it balances on 50 cm length of the potentiometer wire then internal resistance r of the battery is

A 10 m long wire of uniform cross section and 20 Omega resistance is used in a potentiometer. The wire is connected in series with a battery of 5 V along with an external resistance of 480 Omega . If and unknown emf E is balanced at 6.0 m length of the wire,then the value of unknown emf is

In fig. battery E is balanced on 55cm length of potentiometer wire but when a resistance of 10Omega is connected in parallel with the battery then it balances on 50cm length of the potentiometer wire then internal resistance r of the battery is:-

The length of a potentiometer wire AB is 600 cm , and it carries a constant current of 40 mA from A to B . For a cell of emf 2 V and internal resistance 10 Omega , the null point is found at 500 cm from A . When a voltmeter is connected across the cell, the balancing length of the wire is decreased by 10 cm . Reading of the voltmeter is

There is a potentiometer wire of length 1200 cm and 60 mA current is flowing in it. A battery of emf 5V and internal resistance of 20 ohm is balanced on potentiometer wire with balancing length 1000 cm. The resistance of potentiometer wire is

In a potentiometer circuit, the emf of driver cell is 2V and internal resistance is 0.5 Omega . The potentiometer wire is 1m long . It is found that a cell of emf 1V and internal resistance 0.5 Omega is balanced against 60 cm length of the wire. Calculate the resistance of potentiometer wire.

NTA MOCK TESTS-NTA NEET SET 47-PHYSICS

A magnet is suspended in such a way that it oscillates in the horizont...
Text Solution
|
In the circuit shown in figure, reading of voltmeter is V1 when only S...
Text Solution
|
The length of a potentiometer wire is 1m and its resistance is 4Omega ...
Text Solution
|
The magnetic flux through a coil varies with time as phi=5t^2+6t+9 Th...
Text Solution
|
A wire is bent to form a semicircle of the radius a. The wire rotates ...
Text Solution
|
A body of mass 1g and carrying a charge 10^(-8)C passes from two point...
Text Solution
|
How much positive charge should be given to the earth so as to have th...
Text Solution
|
Figure. shows a conducting loop ABCDA placed in a uniform magnetic fie...
Text Solution
|
Choose the wrong statements
Text Solution
|
During total solar eclipse Fraunhoffer's lines appear bright because -
Text Solution
|
Two moles of an ideal gas are undergone a cyclic process 1-2-3-1. If n...
Text Solution
|
70 calories of heat required to raise the temperature of 2 moles of an...
Text Solution
|
Two strings of copper are stretched to the same tension. If their cros...
Text Solution
|
The temperature of a body on Kelvin scale is found to be x K . When it...
Text Solution
|
Which of the following statements is correct for any thermodynamic sys...
Text Solution
|
A bimetallic strip consists of metals X and Y. It mounted rigidly at t...
Text Solution
|
The average velocity of a body moving with uniform acceleration after ...
Text Solution
|
The x and y coordinates of a particle at any time t are given by x = 2...
Text Solution
|
Three blocks of massage m1,m2 and m3 are placed on a horizontal fricti...
Text Solution
|
A smooth sphere of mass m is moving on a horizontal plane with a velo...
Text Solution
|