# How to find the inductance of a coil if it is known that the current is 4A and the energy of the magnetic field is 0.01J?

October 13, 2021 | education

| Initial data: I (coil current) = 4 A, W (coil magnetic field energy) = 0.01 J.

We express the inductance of the coil from the following formula: W = L * I2 / 2 and L = 2 * W / I ^ 2.

Let’s calculate: L = 2 * 0.01 / 4 ^ 2 = 0.00125 H or 1.25 mH.

Answer: The inductance of the coil is 1.25 mH.

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