JEE Main 2022 · 29 Jun · Shift 1 · Physics Q51

← JEE Main 2022 · 29 Jun · Shift 1

PhysicsInteger+4 / -1Question 51 of 90

Two coils require 20 minutes and 60 minutes respectively to produce same amount of heat energy when connected separately to the same source. If they are connected in parallel arrangement to the same source; the time required to produce same amount of heat by the combination of coils, will be ______ min.

Your answer

Answer and worked solution

Official answer: 15

Same source. Heat $\propto\frac tR$ , so $R\propto t$ . In parallel the effective resistance gives $t=\frac{20\times60}{80}=15$ min.

Answer: 15

Topics:Electrical power and heating Series and parallel resistors

← Previous question Next question →

JEE Main 2022 · 29 Jun · Shift 1, Physics question 51