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例1图1中理想变压器原、副线圈匝数比n_1:n_2=1:4,原线圈两端接到平行光滑金属导轨上,副线圈与电阻R串联成
Example 1 In Fig.1, the ratio of turns of the original transformer and the secondary coil of the ideal transformer is n_1:n_2=1:4. Both ends of the primary coil are connected to a parallel smooth metal rail, and the secondary coil and the resistor R are connected in series.