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MHT CET202617 April 2026Morning ShiftPhysicsSemiconductorsActual

In the circuit shown in figure all the three diodes D1, D2, D3 have forward resistance 50 each and infinite backward resistance. If the battery voltage is 5V, the current through 100 resistance is

Options

  1. A60 mA
  2. B30 mA
  3. C20 mA
  4. D10 mA

Correct answer

B. 30 mA

Step-by-step solution

The positive terminal of the 5 V battery is connected to the left side of the circuit, making diodes D1 and D2 forward-biased and diode D3 reverse-biased. Since D3 has infinite backward resistance, it acts as an open circuit and no current flows through its branch. The forward resistance of D1 and D2 is 50 each. The resistance of the top branch is R₁ = 50 + 150 = 200 . The resistance of the middle branch is R₂ = 50 + 50 = 100 . These two branches are in parallel, so their equivalent resistance R_p is: R_p = R₁ R₂ R

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