Current Electricity
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Questions and Answers

What is the ratio of the equivalent resistance of n identical resistances connected in series and in parallel?

  • 1/n
  • 1/n^2
  • n^2 (correct)
  • n

    • What is the equivalent resistance of resistors R1 and R2 connected in series?

  • R1R2 / (R1 + R2)
  • (R1R2) / (R1 + R2)
  • R1 - R2
  • R1 + R2 (correct)

    • What is the condition for a Wheatstone bridge to be balanced?

  • R1 + R2 = R3 + R4
  • R1/R3 = R2/R4
  • R1R2 = R3R4
  • R1/R2 = R3/R4 (correct)

    • What is the equivalent resistance of a bundle of n identical resistors each of resistance R, connected in parallel?

    <p>R/n</p> Signup and view all the answers

    What is the condition for points to have the same potential in a network?

    <p>They must be on the perpendicular axis of symmetry.</p> Signup and view all the answers

    What happens when a network is folded about the parallel axis of symmetry?

    <p>The overlapping nodes have the same potential.</p> Signup and view all the answers

    What is the characteristic of the axis AA' in the given network?

    <p>It is the parallel axis of symmetry.</p> Signup and view all the answers

    Which of the following points are at the same potential in the given network?

    <p>Points 2, 0, and 4</p> Signup and view all the answers

    What is the equivalent resistance of two 10Ω resistors connected in parallel?

    <p>5Ω</p> Signup and view all the answers

    In a balanced wheatstone bridge, what is the current through the resistor connected between the midpoint of the two arms?

    <p>Zero</p> Signup and view all the answers

    What is not a characteristic of points lying on the parallel axis of symmetry?

    <p>They can never have the same potential.</p> Signup and view all the answers

    What is the equivalent resistance of a infinite network of 1Ω resistors connected as shown in the figure?

    <p>1Ω</p> Signup and view all the answers

    What is the equivalent resistance of a circuit with two resistors R1 and R2 connected in series?

    <p>R1 + R2</p> Signup and view all the answers

    In a circuit with four resistors connected to form the sides of a rectangle, what is the method used to find the equivalent resistance?

    <p>Series and parallel combination</p> Signup and view all the answers

    What is the main advantage of using a potentiometer over a voltmeter in measuring the emf of a cell?

    <p>Potentiometers do not draw any current from the cell</p> Signup and view all the answers

    What is the purpose of the supplier battery or driver cell in a potentiometer circuit?

    <p>To provide a known voltage for comparison</p> Signup and view all the answers

    What is the function of the galvanometer in a potentiometer circuit?

    <p>To detect the null point or zero deflection</p> Signup and view all the answers

    What is the material used to make the potentiometer wire?

    <p>Constantan</p> Signup and view all the answers

    Why is the potentiometer considered an ideal instrument for measuring the potential difference of a cell?

    <p>It is an ideal instrument of infinite resistance</p> Signup and view all the answers

    What is the process of determining the potential gradient experimentally known as?

    <p>Standardization of potentiometer</p> Signup and view all the answers

    What is the purpose of increasing the length of the potentiometer wire?

    <p>To increase the sensitivity of the potentiometer</p> Signup and view all the answers

    What is the characteristic of a potentiometer that does not draw any current from the source of known emf?

    <p>Infinite resistance</p> Signup and view all the answers

    What is the relationship between the sensitivity of a potentiometer and its potential gradient?

    <p>The sensitivity is inversely proportional to the potential gradient</p> Signup and view all the answers

    What is the advantage of a potentiometer over a voltmeter?

    <p>A potentiometer measures potential difference more accurately than a voltmeter</p> Signup and view all the answers

    What is the primary reason for ensuring that the diameter of potentiometer wire is uniform everywhere?

    <p>To maintain a constant potential gradient</p> Signup and view all the answers

    What is the factor that the potential gradient of a potentiometer wire directly depends on?

    <p>The resistance per unit length of the potentiometer wire</p> Signup and view all the answers

    What is the purpose of connecting all higher potential points of primary and secondary circuits together at point A?

    <p>To ensure that the potential difference is measured accurately</p> Signup and view all the answers

    What is the requirement for the specific resistance of the potentiometer wire?

    <p>It must be high but its temperature coefficient of resistance must be low</p> Signup and view all the answers

    What is the effect of changing the diameter of the potentiometer wire on the potential gradient?

    <p>The potential gradient remains unchanged</p> Signup and view all the answers

    What happens when the potential difference across the galvanometer is greater than the emf of the unknown cell?

    <p>The current flows in the galvanometer circuit in one direction</p> Signup and view all the answers

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