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In the following circuits, PN-junction diodes D 1 , D 2 and D 3 are ideal for the following potential of A and B , the correct increasing order of resistance between A and B will be ( i ) - 10 V , - 5 V ( ii ) - 5 V , - 10 V ( iii ) - 4 V , - 12 V

Options

  1. A( i ) < ( ii ) < ( iii )
  2. B( iii ) &#160; &#60; &#160; ( ii ) &#160; &#60; &#160; ( i )
  3. C( ii ) &#160; = &#160; ( iii ) &#160; &#60; &#160; ( i )
  4. D( i ) &#160; = &#160; ( iii ) &#160; &#60; &#160; ( ii )

Correct answer

C. ( ii ) &#160; = &#160; ( iii ) &#160; &#60; &#160; ( i )

Step-by-step solution

i) In this case of current will flow from B top A. No current will flow through branch C, E (as marked in figure) &#8658;&#160;&#160;&#160; R eq = R 4 + R + R 4 = 3 R 2 ii) Here current will flow from A to B so no current will flow in branch D &#8658;&#160;&#160;&#160; R eq = R 4 + R 2 + R 4 = R iii) Here also current will flow from A to B, so R eq = R same as (ii) &#8658;&#160;&#160;&#160; R ii = R iii&#160; &#60;&#160;R i

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