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(A) An ideal ammeter has zero resistance. In the given circuit,ammeter $A_2$ is connected in parallel with the branch containing the $10\,\Omega$ resi

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Zero

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(A) An ideal ammeter has zero resistance. In the given circuit,ammeter $A_2$ is connected in parallel with the branch containing the $10\,\Omega$ resistor and ammeter $A_1$.Since $A_2$ is ideal,its resistance is $0\,\Omega$. This creates a short circuit across the branch containing $A_1$ and the $10\,\Omega$ resistor.Because the current always follows the path of least resistance,all the current from the source will flow through the ideal ammeter $A_2$.Consequently,no current will flow through the branch containing $A_1$ and the $10\,\Omega$ resistor.Therefore,the reading of ammeter $A_1$ is $0\,A$.

In the given circuit,if the measuring instruments are ideal,then the reading of ammeter $A_1$ is:

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