In the figure shown below, select the correct options.

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If both ammeter and voltmeter are ideal, then reading of ammeter is zero, reading of voltmeter is 10V

If both ammeter and voltmeter are ideal, then reading of ammeter is 10A, reading of voltmeter is 0V.

If ammeter is non ideal, voltmeter is ideal, then reading of ammeter is less than 10A, reading of voltmeter is 10V.

If ammeter is ideal, voltmeter is non ideal, then reading of ammeter is less than 10A, reading of voltmeter is less than 10V.

answer is A.

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Detailed Solution

Concept: The resistance of an ideal voltmeter is infinite, whereas the resistance of an ideal ammeter to current flow is zero. If both parts are not ideal, they will both provide a finite amount of resistance in the circuit, increasing the voltage drop across them. Readings will alter as a result of this.
Since there are several choices, we shall examine each one separately.
Option 1: If both the ammeter and the voltmeter are perfect, then the voltmeter will operate as an open switch and current will flow through the circuit since it has infinite resistance. As a result, the ammeter will read zero and the voltmeter will read 10 V. This option is the correct answer.
Option 2: Option 2 is inappropriate if neither the ammeter nor the voltmeter are ideal.
Option 3: If the voltmeter and ammeter are both perfect, the voltmeter will serve as an open switch in this case as well, causing the voltmeter to display 10 V and the ammeter to read zero.
So, this choice is the right one.
Option 4: There will be some finite resistance in addition to 10 because of the voltmeter if the ammeter and voltmeter are not optimal. This could result in a drop in voltage across the voltmeter. As a result, as the circuit's net resistance is raised, the value of the current will decrease, giving an ammeter reading of less than 10A. The voltmeter will read less than 10V due to the increased potential drop across it. This choice is also accurate.
Hence, option 1,3 and 4 is the correct answer.

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Result Producing online coaching for JEE/NEET of south India

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Best Online Course for CBSE