The solution of the problem 2.73 кр 2 from the problem

The solution of the problem 2.73 кр 2 from the problem

Task 2.73
A current of 1 A flows through a solenoid 0.25 m long having a number of turns 500. The cross-sectional area is 15 cm2. An iron core is inserted into the solenoid. Find the energy of the magnetic field of the solenoid. The dependence B = f (H) is shown in Fig. 4.

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