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Why is there sudden increase in current in zener diode? (a) due to rupture of bonds (b) resistance of depletion layer becomes less

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Why is there sudden increase in current in zener diode? 

(a) due to rupture of bonds 

(b) resistance of depletion layer becomes less 

(c) due to high doping 

(d) none of the above.

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(a) due to rupture of bonds

 The sudden increase in current in a zener diode is due to the rupture of many covalent bonds.

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