For the identical silicon diodes (assuming rto be zero), the value of  in figure is:

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
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  1. 14.09 mA
  2. 7.05 mA
  3. 21.12 mA
  4. 5 mA

Answer (Detailed Solution Below)

Option 1 : 14.09 mA
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Detailed Solution

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Concept:

At forward bias condition → Diode should be replaced with a battery source of value equal to its barrier potential(for silicon 0.7 V)circuit and the equivalent forward resistance rf.

At reverse bias condition → Diode should be replaced with an open circuit.

Calculation:

For the given circuit arrangement;

Diodes are forward-biased;

As the diodes are identical half of the total source current will flow through each diode.

Then;

∴ 

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