Due to presence of an em-wave whose electric component is given by E = 100 sin(t–kx) NC–1 a cylinder of length 200 cm

Due to presence of an em-wave whose electric component is given by E = 100 sin(t–kx) NC–1 , 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