Under what condition, the current passing through the resistance R can be increased by short - circuiting the battery of emf `E_2` The internal resist

Under what condition, the current passing through the resistance R can be increased by short - circuiting the battery of emf `E_2` The internal resist
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Under what condition, the current passing through the resistance R can be increased by short - circuiting the battery of ... (1)r_(2)gtE_(2)(R+r_(1))`
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