Question

In the circuit given below, V(t) is the sinusoidal voltage source. Voltage drop VAB(t) across the resistance R is 

• A. is half wave rectified
• B. is full wave rectified
• C. has the same peak values in the positive and negative half cycles
• D. has different peak values during positive and negative half cycle

Hint:

If different resistances conduct during different half cycles, the output will be asymmetric.

Answer 1

The Correct Option is D

Step 1: During the positive half cycle of V(t): 
• Diode D₁ is forward biased • Diode D₂ is reverse biased • Current flows through R₁ and R 

Step 2: During the negative half cycle of V(t): 
• Diode D₁ is reverse biased • Diode D₂ is forward biased • Current flows through R₂ and R 

Step 3: Since R₁ ≠ R₂, the current magnitude (and hence voltage drop across R) is different in the two half cycles. ⟹ VAB(t) has different peak values in positive and negative half cycles.