Q. When the voltage across the zener diode increases_

A
temperature remains constant and crystal ions vibrate with large amplitudes
B
temperature increases and crystal ions vibrate with large amplitudes
C
temperature remains constant and crystal ions vibrate with smaller amplitudes
D
temperature decreases and crystal ions vibrate with large amplitudes
Solution:

When voltage is increased, the tunnelling at reverse bias increases. The voltage rises temperature. The crystal ions with greater thermal energy tend to vibrate with larger amplitudes.

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