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An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases?
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An ammeter and a voltmeter are joined in series to a cell. Their readi...
**Explanation:**
When an ammeter and a voltmeter are joined in series to a cell, the ammeter measures the current flowing through the circuit (in amperes) and the voltmeter measures the potential difference across the cell (in volts).
If a resistance is joined in parallel with the voltmeter, the circuit configuration changes. Let's analyze the effect of this change on the readings of the ammeter and the voltmeter.
**a) Both A and V decrease:**
This option is not correct. When a resistance is added in parallel with the voltmeter, it provides an alternative path for current to flow. This results in an increase in the total current flowing in the circuit. Therefore, the ammeter reading (A) should increase, not decrease.
**b) Both A and V increase:**
This option is also not correct. As mentioned above, the addition of a resistance in parallel with the voltmeter increases the total current flowing in the circuit. However, the voltmeter measures the potential difference across the cell, which remains the same regardless of the additional parallel resistance. Therefore, the voltmeter reading (V) should remain unchanged, not increase.
**c) A increases, V decreases:**
This option is correct. When a resistance is joined in parallel with the voltmeter, it provides an alternative path for current to flow. As a result, some of the current that was previously flowing through the voltmeter will now flow through the parallel resistance. This causes a decrease in the current passing through the voltmeter, leading to a decrease in its reading (V).
At the same time, the total current flowing in the circuit increases due to the additional parallel resistance. This increase in current will also pass through the ammeter, causing an increase in its reading (A).
**d) A decreases, V increases:**
This option is not correct. As explained above, the addition of a resistance in parallel with the voltmeter increases the total current flowing in the circuit. Therefore, the ammeter reading (A) should increase, not decrease. Additionally, the voltmeter measures the potential difference across the cell, which remains the same regardless of the additional parallel resistance. Therefore, the voltmeter reading (V) should remain unchanged, not increase.
In conclusion, option c) is the correct answer. The ammeter reading (A) increases, and the voltmeter reading (V) decreases when a resistance is joined in parallel with the voltmeter.
When an ammeter and a voltmeter are joined in series to a cell, the ammeter measures the current flowing through the circuit (in amperes) and the voltmeter measures the potential difference across the cell (in volts).
If a resistance is joined in parallel with the voltmeter, the circuit configuration changes. Let's analyze the effect of this change on the readings of the ammeter and the voltmeter.
**a) Both A and V decrease:**
This option is not correct. When a resistance is added in parallel with the voltmeter, it provides an alternative path for current to flow. This results in an increase in the total current flowing in the circuit. Therefore, the ammeter reading (A) should increase, not decrease.
**b) Both A and V increase:**
This option is also not correct. As mentioned above, the addition of a resistance in parallel with the voltmeter increases the total current flowing in the circuit. However, the voltmeter measures the potential difference across the cell, which remains the same regardless of the additional parallel resistance. Therefore, the voltmeter reading (V) should remain unchanged, not increase.
**c) A increases, V decreases:**
This option is correct. When a resistance is joined in parallel with the voltmeter, it provides an alternative path for current to flow. As a result, some of the current that was previously flowing through the voltmeter will now flow through the parallel resistance. This causes a decrease in the current passing through the voltmeter, leading to a decrease in its reading (V).
At the same time, the total current flowing in the circuit increases due to the additional parallel resistance. This increase in current will also pass through the ammeter, causing an increase in its reading (A).
**d) A decreases, V increases:**
This option is not correct. As explained above, the addition of a resistance in parallel with the voltmeter increases the total current flowing in the circuit. Therefore, the ammeter reading (A) should increase, not decrease. Additionally, the voltmeter measures the potential difference across the cell, which remains the same regardless of the additional parallel resistance. Therefore, the voltmeter reading (V) should remain unchanged, not increase.
In conclusion, option c) is the correct answer. The ammeter reading (A) increases, and the voltmeter reading (V) decreases when a resistance is joined in parallel with the voltmeter.
Community Answer
An ammeter and a voltmeter are joined in series to a cell. Their readi...
Option C
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An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases?
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An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases?.
An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter a) both A and V decreases b) both A and V increases c) A increases, V decreases d) A decreases, V increases?.
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