Htx_x346
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How do you do this pleaseeee helpName:  278CD790-C77E-4A57-9802-E3ADF3806C42.jpeg
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Last edited by Htx_x346; 1 month ago
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username5318474
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The voltmeter always measures the terminal pd, the voltage suplied to the circuit. When the switch is open, terminal pd = emf. So emf of this cell is V.

When switch is closed, V/3 is recorded and since this is the terminal pd, this is what has been supplied to the series cicuit. This means the internal resistor uses 2/3 V.

Voltages are split based on the resistance of the component.
So if
1/3 V is given to a series circuit with a total resistance of 2 Ohms,
then 2/3 V must have been provided to the internal resistor of 4 ohms.

1/3 V for 2 Ohms
2/3 V for 4 Ohms.

Option C
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