For the two cells having same EMF E and internal resistance $r$, the current passing through the external resistor $6\ \Omega$ is same when both the cells are connected either in parallel or in series. The value of internal resistance $r$ is _______ $\Omega$.

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For the two cells having same EMF E and internal resistance $r$ , the current passing through the external resistor $6\ \Omega$ is same when both the cells are connected either in parallel or in series. The value of internal resistance $r$ is _______ $\Omega$ .

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For the two cells having same EMF E and internal resistance rrr, the current passing through the external resistor 6 Ω6\ \Omega6 Ω is same when both the cells are connected either in parallel or in series. The value of internal resistance rrr is _______ Ω\OmegaΩ.

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For the two cells having same EMF E and internal resistance $r$ , the current passing through the external resistor $6\ \Omega$ is same when both the cells are connected either in parallel or in series. The value of internal resistance $r$ is _______ $\Omega$ .