图1中的变压器为理想变压器，原线圈的匝数n1与副线圈的匝数n2之比

图1中的变压器为理想变压器，原线圈的匝数n₁与副线圈的匝数n₂之比为10 : 1。变压器的原线圈接如图2所示的正弦式电流，两个20Ω的定值电阻串联接在副线圈两端。电压表V为理想电表。则（）

A．原线圈上电压的有效值为100V

B．原线圈上电压的有效值约为70.7V

C．电压表V的读数为5.0V

D．电压表V的读数约为3.5V

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图1中的变压器为理想变压器，原线圈的匝数n1与副线圈的匝数n2之比

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