Question

A d.c. battery of V volts is connected to a series combination of a resistor R and an ideal diode D as shown in the figure below. The potential difference across R will be 

• A. 2V when diode is forward biased
• B. Zero when diode is forward biased
• C. V when diode is reverse biased
• D. V when diode is forward biased

Hint:

An ideal diode has zero resistance in forward bias and infinite resistance in reverse bias.

Answer 1

The Correct Option is D

Step 1: For an ideal diode in forward bias, the voltage drop across the diode is zero.
Step 2: Hence, the entire battery voltage V appears across the resistor R.
Step 3: Therefore, the potential difference across R is V.