Home
Class 12
PHYSICS
Statement I: The resistance of an ideal ...

Statement I: The resistance of an ideal voltmeter should be infinite.
Statement II: Lower resistance of voltmeters gives a reading lower than the actual potential difference across the terminals.

A

Statement `1` is true, Statement `2`is True , Statement `2` is correct explanation for Statement `1`.

B

Statement `1` is True, Statement `2` is True, Statement `2` is NOT a correct explantion for Statement `1`.

C

Statement `1` is True, Statement `2` is False.

D

Statement `1` is False, Satement `2` is True.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements, we will break down the concepts of voltmeters, their resistance, and how they affect the readings of potential difference. ### Step-by-Step Solution: **Step 1: Understanding the Ideal Voltmeter** - An ideal voltmeter is designed to measure the potential difference (voltage) across two points in a circuit without affecting the circuit itself. - For a voltmeter to not draw any current from the circuit, its resistance must be infinite. **Step 2: Analyzing Statement I** - Statement I claims that the resistance of an ideal voltmeter should be infinite. - If the resistance is infinite, then no current flows through the voltmeter, which means it does not affect the circuit. Therefore, this statement is true. **Step 3: Analyzing Statement II** - Statement II states that a lower resistance of voltmeters gives a reading lower than the actual potential difference across the terminals. - When a voltmeter with lower resistance is connected across a circuit, it draws some current. This current causes a voltage drop across the voltmeter itself, leading to a reading that is less than the actual voltage across the terminals. **Step 4: Comparing the Two Statements** - Since Statement I is true (the ideal voltmeter must have infinite resistance), and Statement II correctly explains why a voltmeter with lower resistance gives a lower reading, we can conclude that both statements are true. - Moreover, Statement II serves as a correct explanation for Statement I. **Step 5: Conclusion** - Both statements are true, and Statement II is the correct explanation for Statement I. Therefore, the answer is that both statements are correct. ### Final Answer: Both Statement I and Statement II are true, with Statement II being the correct explanation for Statement I. ---

To analyze the given statements, we will break down the concepts of voltmeters, their resistance, and how they affect the readings of potential difference. ### Step-by-Step Solution: **Step 1: Understanding the Ideal Voltmeter** - An ideal voltmeter is designed to measure the potential difference (voltage) across two points in a circuit without affecting the circuit itself. - For a voltmeter to not draw any current from the circuit, its resistance must be infinite. ...
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELECTRICAL MEASURING INSTRUMENTS

    CENGAGE PHYSICS ENGLISH|Exercise Comprehansion|15 Videos
  • ELECTRICAL MEASURING INSTRUMENTS

    CENGAGE PHYSICS ENGLISH|Exercise Integer|8 Videos
  • ELECTRICAL MEASURING INSTRUMENTS

    CENGAGE PHYSICS ENGLISH|Exercise Multiple Correct|7 Videos
  • ELECTRIC POTENTIAL

    CENGAGE PHYSICS ENGLISH|Exercise DPP 3.5|15 Videos
  • ELECTROMAGNETIC INDUCTION

    CENGAGE PHYSICS ENGLISH|Exercise compression type|7 Videos

Similar Questions

Explore conceptually related problems

Statement A : The resistance of ideal ammeter is zero Statement B : The resistance of ideal voltmeter is infinity Choose the correct option among the following.

The voltmeter shown in the figure reads 10V across 40 omega . The resistance of voltmeter is

Knowledge Check

  • A voltmeter having a resistance of 1800 Omega employed to measure the potential difference across a 200 Omega resistor which is connected to the terminals of a dc power supply having an emf of 50 V and an internal resistance of 20 Omega . What is the percentage decrease in the potential difference across the 200 Omega resistor as a result of connecting the voltmeter across it?

    A
    `1%`
    B
    `5%`
    C
    `10%`
    D
    `25%`
  • Similar Questions

    Explore conceptually related problems

    If the reading of the ideal voltmeter shown in the circuit is 2V the internal resistance of the two identical cells is

    A battery of emf 1.4 V and internal resistance 2 Omega is connected to a resistor of 100 omega resistance through an ammeter. This resistance of the ammeter is 4//3 Omega . A voltmeter has also been connected to find the potential difference across the resistor. a. Draw the circuit diagram. b. The ammeter reads 0.02 A . What is the resistance of the voltmeter? c. The voltmeter reads 1.1 V . What is the error in the reading?

    In the given circuit, the reading of ideal voltmeter is E//2 . The internal resistance of the battery is

    (A) : The resistance of voltmeter is very small as compared to the resistance of the galvanometer, from which it is obtained. (R) : The voltmeter is connected in series to the conductor across which potential difference is to be measured.

    According to this diagram , the potential difference across the terminals is ( internal resistance of cell =r)

    A cell of e.m. E and internal resistance r is connected across a resistancer. The potential difference between the terminals of the cell must be

    A voltmeter and an ammeter are connected in series to an ideal cell of emf E . The voltmeter reading is V , and the ammeter readings is I . Then (i) V lt E (ii) the voltmeter resistance is V// I (iii) the potential difference across the ammeter is E - V (iv) Voltmeter resistance + ammeter resistance = E//I Correct statements are