Get Answers to all your Questions

header-bg qa

In the given figure, a diode D is connected to an external resistance R = 100 \Omega and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be :

  • Option 1)

    40 mA

  • Option 2)

    20 mA

  • Option 3)

    35 mA

  • Option 4)

    30 mA

 

Answers (1)

As we learnt in

P -N junction as diode -

It is a one way device. It offers a low resistance when forward biased and high resistance when reverse biased.

- wherein

R = 0, Forward 


ightarrow infty Reverse

 

The emf developed across diode is 0.5 V.

Total applies potential = 3.5 V

\therefore Potential difference across resistance of 100 \Omega is 3 V.

Current across 100 \Omega resistance \frac{3\:V}{100\Omega }= 30\:mA


Option 1)

40 mA

This option is incorrect

Option 2)

20 mA

This option is incorrect

Option 3)

35 mA

This option is incorrect

Option 4)

30 mA

This option is correct

Posted by

Vakul

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks