Discussion
Assertion (A) : UJT is used in relaxation oscillators.
Reason (R) : UJT has negative resistance region in its characteristics.
Answer: A
Both statements are true and the reason explains the assertion, so the answer is option (A).
A UJT is used in relaxation oscillators. Once the emitter voltage reaches the peak point, the device enters a negative resistance region and discharges the timing capacitor quickly, which gives the repeated charge and discharge cycle.
That negative resistance region is the reason given, so (B) is wrong. Options (C) and (D) call a true statement false.
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