JEE Main 2024 Physics question
A physical quantity Q is found to depend on quantities a, b, c by the relation . The percentage error in a, b and c are 3 %, 4% and 5 % respectively. Then, the percentage error in Q is :
Answer: (B)
Solution
ΔQ/Q = 4Δa/a + 3Δb/b + 2Δc/c, so the percentage error = 4 × 3 + 3 × 4 + 2 × 5 = 12 + 12 + 10 = 34%.