Question

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In the circuit below, there is a voltage drop of 0.7 V across the diode D in forward bias, while no current flows through it in reverse bias.

If Vin is a sinusoidal signal of frequency 50 Hz with an RMS value of 1 V, the maximum current that flows through the diode is closest to

  1. 1 A
  2. 0.14 A
  3. 0 A
  4. 0.07 A

Answer (Detailed Solution Below)

Option 3 : 0 A

Detailed Solution

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Explanation:

Case-1-When diode is in forward biasing

Given, 

Now, peak voltage 

  • Current in 

This is low current

  • Current in 

This is high current as comparison to  resistor in forward biasing 

So, Forward biasing is not possible in this circuit.

Case-2-When the circuit is in Reverse biasing-

This circuit is possible in reverse biasing.

In Reverse biasing the current in the diode should be zero.

So, the correct answer is 

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