Multiple choice general knowledge science & technology

Which of the following have negative resistance phenomenon

  1. Varactor diodes

  2. Tunnel diodes

  3. Schottky diodes

  4. LEDs
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B Correct answer
Explanation

Tunnel diodes exhibit negative resistance where current decreases as voltage increases over a specific range, due to quantum tunneling effect. This makes them useful in high-frequency oscillators. Varactor diodes are voltage-variable capacitors. Schottky diodes have low forward voltage drop. LEDs emit light.

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