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NEETPhysicsSemiconductors

In a laboratory experiment, a student connects an ideal diode and a load resistor in series with an alternating voltage source. An oscilloscope is connected across one of these two components to observe the voltage waveform. The student observes that the voltage across this component is zero during the positive half-cycle of the AC source, and it exactly follows the negative half-sine wave of the source during the ne

Options

  1. AResistor; forward-biased
  2. BDiode; reverse-biased
  3. CDiode; forward-biased
  4. DResistor; reverse-biased

Correct answer

C. Diode; forward-biased

Step-by-step solution

During the positive half-cycle, the voltage across the observed component is zero. For an ideal diode, a zero voltage drop occurs when it is forward-biased (acting as a short circuit). During the negative half-cycle, the voltage across the component equals the source voltage. This occurs when the ideal diode is reverse-biased (acting as an open circuit), preventing current flow so that no voltage drops across the resistor, and the entire source voltage appears across the diode. Therefore, the oscilloscope is connec

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