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For maximum power developed in the circuit, the value of the internal resistance ' \( r \) ' must be, if all the cells are identical, each of emf \( E \) and the internal resistance ' \( r \) '.
(1) \( r\frac{3}{7} \Omega \)
(2) \( r\frac{3}{7} \Omega \)
(3) \( r=\frac{3}{7} \Omega \)
(4) \( r \geq \frac{3}{7} \Omega \)
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