[填空题]
A silicon diode, whose current-voltage characteristics are b1 fqf(o990 mmm l2ybpgiven in (Fig. Bed;g ,p20gps;. . xf qjav/p.o.yxmdtelow), is connect;yj,g2. 0 apmv .dtqp.pefgx .s/x ;oded in series with a battery and a $ 960-\Omega $ resistor. What battery voltage is needed to produce a 12-mA current? $V_{\text{battery}}$= V