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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.
Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.
- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R are true but R is NOT the correct explanation of A
- c)A is true but R is false
- d)A is false and R is true
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Directions : In the following questions, A statement of Assertion (A)...
Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.
Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. of a cell since it does not draw any net current from the cell.
Explanation:
- The assertion states that a potentiometer is used to measure the e.m.f. of a cell. This means that a potentiometer is a device that can be used to measure the potential difference (voltage) across a cell.
- The reason given to support this assertion is that a potentiometer is preferred over a voltmeter to measure the e.m.f. of a cell since it does not draw any net current from the cell.
- A potentiometer is a device that works on the principle of a balanced bridge circuit. It consists of a long uniform resistance wire, a galvanometer, and a jockey. The jockey is used to make a sliding contact on the resistance wire.
- When the jockey is moved along the wire, the galvanometer shows zero deflection at a particular point. At this point, the potential difference between the jockey and one end of the wire is equal to the e.m.f. of the cell being measured. This is because the potential difference across the wire is proportional to the length of wire on either side of the jockey.
- Unlike a voltmeter, which is connected in parallel to the cell, a potentiometer does not draw any net current from the cell being measured. This is because the potentiometer works on the principle of a balanced bridge circuit, where the potential difference is balanced and no current flows through the galvanometer.
- Therefore, the reason given in the assertion is correct. The potentiometer does not draw any net current from the cell, making it a preferred device for measuring the e.m.f. of a cell.
Conclusion:
Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.
Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. of a cell since it does not draw any net current from the cell.
Explanation:
- The assertion states that a potentiometer is used to measure the e.m.f. of a cell. This means that a potentiometer is a device that can be used to measure the potential difference (voltage) across a cell.
- The reason given to support this assertion is that a potentiometer is preferred over a voltmeter to measure the e.m.f. of a cell since it does not draw any net current from the cell.
- A potentiometer is a device that works on the principle of a balanced bridge circuit. It consists of a long uniform resistance wire, a galvanometer, and a jockey. The jockey is used to make a sliding contact on the resistance wire.
- When the jockey is moved along the wire, the galvanometer shows zero deflection at a particular point. At this point, the potential difference between the jockey and one end of the wire is equal to the e.m.f. of the cell being measured. This is because the potential difference across the wire is proportional to the length of wire on either side of the jockey.
- Unlike a voltmeter, which is connected in parallel to the cell, a potentiometer does not draw any net current from the cell being measured. This is because the potentiometer works on the principle of a balanced bridge circuit, where the potential difference is balanced and no current flows through the galvanometer.
- Therefore, the reason given in the assertion is correct. The potentiometer does not draw any net current from the cell, making it a preferred device for measuring the e.m.f. of a cell.
Conclusion:
Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.
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Community Answer
Directions : In the following questions, A statement of Assertion (A)...
Potentiometer is used to measure the e.m.f. of a cell. The assertion is true. Voltmeter draws certain amount of current from the cell. So, V = E – iR. The measured value by the voltmeter is less than the actual e.m.f. of the cell. But the potentiometer draws no net current at balance point, hence it measures the actual e.m.f. of the cell. So, the reason is also true and explains the assertion properly.
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer?
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer?.
Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
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Here you can find the meaning of Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Potentiometer is used to measure the e.m.f. of a cell.Reason (R): Potentiometer is preferred over voltmeter to measure the e.m.f. a cell since it does not draw any net current from the cell.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is trueCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 12 tests.
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