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Calculate the change in the voltage when RL is connected as shown

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Calculate the change in the voltage when RL is connected as shown

(a) -10 mA

(b) -15 mA

(c) -20 mA

(d) -25 mA

This question was posed to me in an interview for internship.

Query is from Modelling the Diode Forward Characteristics topic in section Diodes of Electronic Devices & Circuits

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Right option is (c) -20 mA

To explain: When RL is connected it draws approx. 2.1v/1000 A current or 2.1 mA. Hence the current in the diode decreases by approximately 2.1 mA. The voltage change across the diode is thus -2.1mA * 9.6 Ω or -20mA.

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