The inductance of the coil has doubled, and the current has decreased by 2 times. The energy of the magnetic field is equal to …
The initial energy of the magnetic field is equal to Wп1 = L * I ^ 2/2.
After all the manipulations given in the condition Wp2 = 2L * I ^ 2 / (2 * 4) = L * I ^ 2/4
Answer Wp2 = L * I ^ 2/4
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