NTA Abhyas JEE Main2020PhysicsCurrent ElectricityPractice
Three resistors of equal resistance are arranged in four different combinations, as shown below. Arrange the combinations in increasing order of power dissipation if it is known that each combination carries the same current.
Options
- A III < II < IV < I
- BII < III < IV < I
- CI < IV < III < II
- D I < III < II < IV
Correct answer
A. III < II < IV < I
Step-by-step solution
P = I 2 R Current is same, so P ∝ R In the first case, it is 3 r , in second case it is 2 3 r , in the third case it is r 3 and in the fourth case the net resistance is 3 r 2 . R III < R II < R IV < R I ∴ P III < P II < P IV < P I