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Which of the following is used to avoid the back EMF in the relay?

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Which of the following is used to avoid the back EMF in the relay?

(a) resistor

(b) capacitor

(c) inductor

(d) diode

I had been asked this question in an interview.

This intriguing question comes from Power Controls topic in chapter Interfacing to the Analog World of Embedded Systems

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Best answer
Correct choice is (d) diode

To explain: In order to get rid of the back EMF which is generated by the relay a diode is connected across the terminals which operate in the reverse bias so that nothing can harm the relay.

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