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题目:如图所示电路中,当R=5Ω时,安培表A的示数为1A;当R=11Ω时,安培表A的示数为0.5A;则当R=____Ω时,安培表A的示数为0.4A.
Title: As shown in the circuit, when R = 5Ω, the ampere A shows the number of 1A; when R = 11Ω, ampere meter A shows the number of 0.5A; then when R = ____ Ω, ampere meter A The indication is 0.4A.