Electrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer questions with solutions

Showing 1–10 of 88 questions

• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  The potentials of the indicated points are maintained as shown. The voltmeter and ammeter are ideal. Find the potential x of the central junction O and the readings of the voltmeter and ammeter.

  

  Options

  • Option A

    x = 4/3 V; voltmeter = 12⅓ V; ammeter = 1/15 A

  • Option B

    x = $\frac{3}{4}$ V; voltmeter = 12 V; ammeter = 1/15 A

  • Option C

    x = 4/3 V; voltmeter = 11⅓ V; ammeter = 1/12 A

  • Option D

    x = 4 V; voltmeter = 12⅓ V; ammeter = 1/5 A

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• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  The galvanometer deflection is θ₀ when key K₁ is closed and K₂ is open. When K₂ is also closed and R₂ is adjusted to 5 Ω, the deflection becomes θ₀/5. Neglect the internal resistance of the battery. Find the galvanometer resistance.

  

  Options

  • Option A

    12Ω

  • Option B

    25Ω

  • Option C

    5Ω

  • Option D

    22Ω

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  JEE Mains 2019

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• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  Resistances R₁ and R₂ each 60Ω are connected in series as shown in figure. The Potential difference between A and B is kept 120 volt. Then what will be the reading of voltmeter connected between the point C and D if resistance of voltmeter is 120Ω.

  

  Options

  • Option A

    48 V

  • Option B

    24 V

  • Option C

    40 V

  • Option D

    None

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• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected between

  

  Options

  • Option A

    B and C

  • Option B

    C and D

  • Option C

    A and D

  • Option D

    B₁ and C₁

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• NumericmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  When two resistances R₁ and R₂ are connected in series and introduced into the left gap of a metre bridge and a resistance of 10 Ω is introduced into the right gap, a null point is found at 60 cm from left side. When R₁ and R₂ are connected in parallel and introduced into the left gap, a resistance of 3 Ω is introduced into the right gap to get null point at 40 cm from left end. The product R₁R₂ is _____ Ω².

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  JEE Mains29 January 2023Shift 2Evening Shift

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• NumericeasyCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  In an experiment to find emf of a cell using a potentiometer, the null-point length for a cell of emf 1.5 V is 60 cm. If this cell is replaced by another cell of emf E, the null-point length increases by 40 cm. If E = x/10 V, the value of x is ______.

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  JEE Mains1 February 2023Shift 1Morning Shift

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• ParagraphmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  In a potentiometer experiment the galvanometer deflection remains one-sided. In case (i) the deflection decreases as the jockey moves from A to B; in case (ii) it increases. Answer the following.

  

  Sub-question 1

  In case (i), which terminal of E₁ is connected at X and how is E₁ related to E?

  Options

  • Option A

    +ve terminal; E₁ > E

  • Option B

    -ve terminal; E₁ > E

  • Option C

    +ve terminal; E₁ < E

  • Option D

    -ve terminal; E₁ < E

  Sub-question 2

  In case (ii), which terminal of E₁ is connected at X?

  Options

  • Option A

    +ve terminal

  • Option B

    -ve terminal

  • Option C

    Either terminal

  • Option D

    Cannot be determined

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• NumericmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  As shown in the figure, the voltmeter reads 2 V across the 5 Ω resistor. The resistance of the voltmeter is ______ Ω.

  

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  JEE Mains6 April 2023Shift 2Evening Shift

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• NumericmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  By error, a student places moving-coil voltmeter V (nearly ideal) in series with the resistance in a circuit in order to read the current, as shown. The voltmeter reading (in V) will be

  

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• MCQeasyCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is:
  A. directly proportional to the length of the potentiometer wire
  B. directly proportional to the potential gradient of the wire
  C. inversely proportional to the potential gradient of the wire
  D. inversely proportional to the length of the potentiometer wire Choose the correct option for the above statements:

  Options

  • Option A

    B and D only

  • Option B

    A and C only

  • Option C

    A only

  • Option D

    C only

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  JEE Mains29 January 2023Shift 2Evening Shift

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