Physics Current Electricity PMDC 2021
PMDC Verified Question 79 of 112
Which of the following bulb has least resistance?
A
50 W
B
100 W
C
200 W
D
300 W
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 300 W
Concept:

For bulbs designed to operate on the same mains voltage, resistance and power are inversely proportional.

Formula:

$$ P = \frac{V^2}{R} \implies R = \frac{V^2}{P} $$

Solution:

  • Since \( R \propto \frac{1}{P} \), the bulb with the highest power rating will have the lowest (least) resistance.


  • Comparing the options, 300 W is the highest power. Therefore, it has the least resistance.


Why other options are incorrect:

  • Opt A: The lowest power bulb (50 W) will have the highest resistance.

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