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15. A 680 Ω load resistor, R_{L}, is connected across a constant current source of 1.2 A. The internal source resistance, R_{s}, is 12 kΩ. The load current, R_{L}, is ________.
(a) 0 A
(b) 1.2 A
(c) 114 mA
(d) 1.14 A
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