For an UJT employed for the triggering of an SCR, standoff

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For an UJT employed for the triggering of an SCR, standoff ratio η = 0·64 and dc source voltage V_BB is 20 V. The UJT would trigger when the emitter voltage is—

1. 12·8 V
2. 13·1 V
3. 10 V
4. 5 V

Correct Option: B

NA