General
Easy
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 10Ω it is balanced against 7.0 cm of the same poleutomelic. What is the internal resistance of the cell?

PhysicsGeneral

  1. 1.14Ω
  2. 1.36Ω
  3. 1.24Ω

    Answer:The correct answer is: 1.14Ω

    Book A Free Demo

    +91

    Grade*

    Related Questions to study

    General
    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
    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
    General
    chemistry-

    The structure of the following polymer is :

    The structure of the following polymer is :

    chemistry-General
    General
    chemistry-

    M is a metal that forms an oxid  When a sample ometal M reacts with onmole of oxygen what will be the ΔH in that case-

    M is a metal that forms an oxid  When a sample ometal M reacts with onmole of oxygen what will be the ΔH in that case-

    chemistry-General
    General
    chemistry-

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

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

    chemistry-General
    General
    chemistry-

    TheenthalpyofformationforC2H4(g),CO2(gand H2O(ella25°and 1atmpressurar52,–39and –286KJmol1 respectivelyThenthalpof combustiooC2Hwill be-

    TheenthalpyofformationforC2H4(g),CO2(gand H2O(ella25°and 1atmpressurar52,–39and –286KJmol1 respectivelyThenthalpof combustiooC2Hwill be-

    chemistry-General
    General
    chemistry-

    IfC6H12O6(s)+9O2(g)→6CO2(g)+6H2O(g); ΔH=680Kcal Thweight oCO2(gproduced when170Kcal oheat is evolved in the combustion

    is-

    IfC6H12O6(s)+9O2(g)→6CO2(g)+6H2O(g); ΔH=680Kcal Thweight oCO2(gproduced when170Kcal oheat is evolved in the combustion

    chemistry-General
    is-
    General
    chemistry-

    Which of thfollowing equations corresponds to theenthalpyofcombustionat298K:-

    Which of thfollowing equations corresponds to theenthalpyofcombustionat298K:-

    chemistry-General
    General
    physics-

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

    As stress is shown on x-axis and strain on y-axis
    So we can say that Y equals cot invisible function application theta equals fraction numerator 1 over denominator tan invisible function application theta end fraction equals fraction numerator 1 over denominator s l o p e end fraction
    So elasticity of wire P is minimum and of wire R is maximum

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

    physics-General
    As stress is shown on x-axis and strain on y-axis
    So we can say that Y equals cot invisible function application theta equals fraction numerator 1 over denominator tan invisible function application theta end fraction equals fraction numerator 1 over denominator s l o p e end fraction
    So elasticity of wire P is minimum and of wire R is maximum
    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
    General
    physics

    The reciprocal of resistivity is called…….

    The reciprocal of resistivity is called…….

    physicsGeneral
    General
    maths-

    The area bounded between the parabola y2 = 4x and the line y = 2x – 4 is equal to

    The area bounded between the parabola y2 = 4x and the line y = 2x – 4 is equal to

    maths-General
    General
    physics

    If a copper wire is stretched to make it n=0.1% longer, then what is the percentage change in its resistance?

    If a copper wire is stretched to make it n=0.1% longer, then what is the percentage change in its resistance?

    physicsGeneral
    General
    chemistry-

    Thstandarmolar heat oformatioof ethane, CO2,andwater(ellarrespectively21.1,–94.1and 68.3Kcal.Thestandardmolarheatofcombustion of ethanwill be-

    Thstandarmolar heat oformatioof ethane, CO2,andwater(ellarrespectively21.1,–94.1and 68.3Kcal.Thestandardmolarheatofcombustion of ethanwill be-

    chemistry-General
    General
    chemistry-

    Given that standarheat enthalph oCH4,C2H4 andC3H8are–17.9,12.5,–24.8Kcal/mol. The ΔH foCH4+C2H4→C3His-

    Given that standarheat enthalph oCH4,C2H4 andC3H8are–17.9,12.5,–24.8Kcal/mol. The ΔH foCH4+C2H4→C3His-

    chemistry-General