Assume that each diode as shown in the figure has a forward bias

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441.

Assume that each diode as shown in the figure has a forward bias resistance of 50 Ω and an infinite reverse bias resistance. The current through the resistance 150 Ω is

          

  • 0.66 A

  • 0.05 A

  • Zero

  • 0.04 A


D.

0.04 A

The circuit is

           

As the lower diode attached to 100 Ω resistance is in reversed biased so, it is non- conducting.

Now, the circuit can be redrawn as,

                  

∴ Current through the circuit, I = VR  

             = 10250 = 0.04 A 


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442.

Two cells A and B of emf 2V and 1.5 V respectively, are connected as shown in figure through an external resistance 10 Ω. The internal resistance of each cell is 5 Ω. The potential difference EA and EB across the terminals of the cells A and B respectively are

              

  • EA = 2.0 V, EB = 1.5 V

  • EA = 2.125 V, EB  = 1.375 V

  • EA = 1.875 V, EB = 1.625 V

  • EA = 1.875 V, EB = 1.375 V


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