A constant voltage is applied to points A, B (Fig. 125) from a source that charges capacitor C. An alternating voltage is applied to the winding of the electromagnet M. The electromagnet oscillates tongue D. The tongue alternately closes the power circuit of the capacitor and the circuit of the galvanometer G. What is the average current through the galvanometer if the frequency of the alternating current is v = 500 Hz, the capacitance of the capacitor C = 1 μF, and the constant voltage V = 100 V? The electromagnet rod and tongue are made of soft magnetic material, i.e. residual magnetization can be neglected. Consider that the capacitor manages to be fully charged during the time the charging circuit is closed, and completely discharged while it is closed to the galvanometer.

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