Physics

General

Easy

### Question

#### A potentiometer wire, which is 4 cm long is connected to the terminals of a battery of steady voltage A leclanche cell gives a nullpoint at 1 m if the length of the potentiometer wire be increased by 1 m, What is the new new position of the null point?

- 1.25 m
- 1.4 m
- 1.75 m
- 1.2 m

#### The correct answer is: 1.25 m

## Book A Free Demo

+91

Grade*

Select Grade

### Related Questions to study

physics

#### In experiment of the potentiometer wire AB of length 100 cm has a resistance of 10Ω, It is connected in series with a resistance R and a cell of emf 2 volts and of negligible internal resistance.A Source of emf 10mV is balanced against a length of of 40 cm the poteatio meter wire. What is the value of the external resistance?

#### In experiment of the potentiometer wire AB of length 100 cm has a resistance of 10Ω, It is connected in series with a resistance R and a cell of emf 2 volts and of negligible internal resistance.A Source of emf 10mV is balanced against a length of of 40 cm the poteatio meter wire. What is the value of the external resistance?

physicsGeneral

physics

#### If the deflection of the galvanometer is the same direction at both the ends of the potential meter wire, then point out the statement which is definitely not the possible reason for the.

#### If the deflection of the galvanometer is the same direction at both the ends of the potential meter wire, then point out the statement which is definitely not the possible reason for the.

physicsGeneral

maths-

#### The area bounded between the parabola y^{2} = 4x and the line y = 2x – 4 is equal to

#### The area bounded between the parabola y^{2} = 4x and the line y = 2x – 4 is equal to

maths-General

physics

#### Consider the potentiometer circuit shown. The potentiometer wire is 600 cm long and having restance 15r At what distance from the point A should the jockey touch the wire to get zero deflection in the galvanometer?

#### Consider the potentiometer circuit shown. The potentiometer wire is 600 cm long and having restance 15r At what distance from the point A should the jockey touch the wire to get zero deflection in the galvanometer?

physicsGeneral

physics-

#### The strain-stress curves of three wires of different materials are shown in the figure. and are the elastic limits of the wires. The figure shows that

As stress is shown on -axis and strain on -axis

So we can say that

So elasticity of wire is minimum and of wire is maximum

So we can say that

So elasticity of wire is minimum and of wire is maximum

#### The strain-stress curves of three wires of different materials are shown in the figure. and are the elastic limits of the wires. The figure shows that

physics-General

As stress is shown on -axis and strain on -axis

So we can say that

So elasticity of wire is minimum and of wire is maximum

So we can say that

So elasticity of wire is minimum and of wire is maximum

chemistry-

#### Which of the following equations corresponds to theenthalpyofcombustionat298K:-

#### Which of the following equations corresponds to theenthalpyofcombustionat298K:-

chemistry-General

chemistry-

#### IfC6H12O6(s)+9O2(g)→6CO2(g)+6H2O(g); ΔH=–680Kcal The weight of CO2(g) produced when170Kcal of heat is evolved in the combustion

is-

#### IfC6H12O6(s)+9O2(g)→6CO2(g)+6H2O(g); ΔH=–680Kcal The weight of CO2(g) produced when170Kcal of heat is evolved in the combustion

chemistry-General

is-

chemistry-

#### TheenthalpyofformationforC2H4(g),CO2(g) and H2O() at 25°C and 1atm. pressure are 52,–394 and –286KJmol–1 respectively. The enthalpy of combustion of C2H4 will be-

#### TheenthalpyofformationforC2H4(g),CO2(g) and H2O() at 25°C and 1atm. pressure are 52,–394 and –286KJmol–1 respectively. The enthalpy of combustion of C2H4 will be-

chemistry-General

chemistry-

#### Accordingtoequation, CH()+15/2O(g)→6CO(g)+3HO() ΔH= –3264.4KJ mol the energy evolved when7.8g benzene is burn tin air will be-

#### Accordingtoequation, CH()+15/2O(g)→6CO(g)+3HO() ΔH= –3264.4KJ mol the energy evolved when7.8g benzene is burn tin air will be-

chemistry-General

chemistry-

#### M is a metal that forms an oxide When a sample of metal M reacts with one mole of oxygen what will be the ΔH in that case-

#### M is a metal that forms an oxide When a sample of metal M reacts with one mole of oxygen what will be the ΔH in that case-

chemistry-General

physics

#### Circuit for the measurement of resistance by potentiometer is shown. The galvanometer is first connected at point-A and zero-deflection is observed at length PJ=10 cm. In the second case, it is connected at a point C and zero deflection is observed at a length 30 cm from . Then what is the unknown resistance X?

#### Circuit for the measurement of resistance by potentiometer is shown. The galvanometer is first connected at point-A and zero-deflection is observed at length PJ=10 cm. In the second case, it is connected at a point C and zero deflection is observed at a length 30 cm from . Then what is the unknown resistance X?

physicsGeneral

physics

#### A potentiometer is preferred over a voltmeter to measure the emf of a cell because....

#### A potentiometer is preferred over a voltmeter to measure the emf of a cell because....

physicsGeneral

physics

#### A 10 m wire potentiometer is connected to an accumulator of steady voltage. A 7.8 m length of it balances the emf of a cell on 'open-circuit'. When cell delivers current through a conductor of resistance Ω it is balanced against 7.0 cm of the same poleutomelic. What is the internal resistance of the cell?

#### A 10 m wire potentiometer is connected to an accumulator of steady voltage. A 7.8 m length of it balances the emf of a cell on 'open-circuit'. When cell delivers current through a conductor of resistance Ω it is balanced against 7.0 cm of the same poleutomelic. What is the internal resistance of the cell?

physicsGeneral

chemistry-

#### The structure of the following polymer is :

#### The structure of the following polymer is :

chemistry-General

physics

#### The reciprocal of resistivity is called…….

#### The reciprocal of resistivity is called…….

physicsGeneral