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(C) The lamps are connected in parallel across an ideal voltage source $E$. In a parallel circuit, the voltage across each lamp remains constant regar

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$2.4$

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(C) The lamps are connected in parallel across an ideal voltage source $E$. In a parallel circuit, the voltage across each lamp remains constant regardless of whether other lamps are switched on or off.Let the resistance of each identical lamp be $R$. The current through each lamp is $I_L = E/R$.When all $5$ lamps are working, the total current measured by the ammeter is the sum of the currents through all $5$ lamps: $I_{total} = 5 	imes (E/R) = 3 \,A$.Therefore, the current through each individual lamp is $I_L = 3 \,A / 5 = 0.6 \,A$.When lamp '$1$' is switched off, the ammeter measures the current flowing through the remaining $4$ lamps.The new total current is $I'_{total} = 4 	imes I_L = 4 	imes 0.6 \,A = 2.4 \,A$.

Five identical electric filament lamps numbered $1$ to $5$ are joined in parallel across an ideal source as shown in the figure. When all the bulbs are working, the reading in the ammeter is $3 \,A$. When lamp '$1$' is switched off, the reading of the ammeter is (in $\,A$)

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