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Question

which and all bulb will glow


  1. 1

  2. 2

  3. 3

  4. 4


Solution

The correct option is B

2


if p region of diode is connected to postive terminal of battery then diode is forward biased.if n region of diode is connected to positive terminal battery then it is reverse biased. forward biased diode has very low resistance .diodes in figure 1 and figure 2 are forward biased . thus bulb 1 and bulb 2 will glow. 

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