A battery of emf E and internal resistance r is connected to the circuit as shown in the figure. When the key $K_{1}$ is closed and $K_{2}$ is open, the ideal voltmeter shows a reading of 18 V. When key $K_{2}$ is closed and $K_{1}$ is open, the voltmeter reading is 24 V. When $K_{1}$ and $K_{2}$ are both open, the voltmeter reading is

Question

A battery of emf E and internal resistance r is connected to the circuit as shown in the figure. When the key

K_{1}

is closed and

K_{2}

is open, the ideal voltmeter shows a reading of 18 V. When key

K_{2}

is closed and

K_{1}

is open, the voltmeter reading is 24 V. When

K_{1}

and

K_{2}

are both open, the voltmeter reading is

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