PREVIOUS YEAR (2020) COMMON P.G ENTRANCE PHYSICS QUESTION SOLUTION -2
*FOR QUESTION 1-35 ; CLICK THE LINK https://biswatutorialphysics.blogspot.com/2021/08/previous-year-2020-common-pg-entrance.html Q/36. The Poynting vector S of an electromagnetic wave is ? (A) 𝑆 = 𝐸⃗ × 𝐻⃗ (B) 𝑆 = 𝐸⃗ × 𝐵⃗ (C) 𝑆 = 𝐸⃗/𝐵⃗ (D) 𝑆 = 𝐸⃗/𝐻⃗ Ans: Poynting vector 𝑆 = (1/ 𝜇) ( 𝐸⃗ × 𝐵⃗ ) If the medium is linear, 𝐻⃗ = 𝐵⃗/𝜇 So, 𝑆 = (1/ 𝜇 )( 𝐸⃗ × 𝜇𝐻⃗ ) = 𝐸⃗ × 𝐻⃗ Q/ 37. For good conductors, skin depth ( 𝛿 ) varies with frequency ( 𝜔 ) as? (A) 1/ 𝜔 (B) 1/√ 𝜔 (C) 𝜔 ...