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There are two batteries 'A' and 'B' havi...

There are two batteries `'A'` and `'B'` having same emf. A has no internal resistance and `B` has some internal restance. An inductance is connected first to `'A'` and the energy in the uniform magnetic field setup inside is `'U'`. It is now disconnected from `'A'` and reconnected to `'B'`. The energy stored in the uniform magnetic field will be

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