JEE Main 2025 Physics question
Due to presence of an em-wave whose electric component is given by E = 100 sin(–kx) , a cylinder of length 200 cm holds certain amount of em-energy inside it. If another cylinder of same length but half diameter than previous one holds same amount of em-energy, the magnitude of the electric field of the corresponding em-wave should be modified as
Answer: (2)
Solution
Energy conservation gives , so , giving N/C