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In a circuit below, the switch is at position 1 at t<0 and at position 2 when t=0. Assume diode has zero voltage drop and storage time. For 0<t<ts, the VR at 1k ohm resistor is given by_____

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In a circuit below, the switch is at position 1 at t<0 and at position 2 when t=0. Assume diode has zero voltage drop and storage time. For 0<t<ts, the VR  at 1k ohm resistor is given by_____

(a) 5V

(b) -5V

(c) 0v

(d) 10V

This question was posed to me in an online quiz.

My question is taken from PN Diode Switching Times topic in chapter Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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Correct option is (b) -5V

Best explanation: At position ‘1’ when connected to +5V, the diode is forward biased and acts as a short circuit. So, VR is 5V. For 0<t<ts  VR is -5V as the diode is in reverse bias. But it holds the conductive property within the storage time period. So, V is -5V.

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