Physics - EM Waves Question with Solution | TestHub

$\stackrel{\rightharpoonup }{\mathrm{B}}=\frac{57}{3\times 10^8}\cos \left[7.5\times 10^6\mathrm{t}-5\times 10^{-3}(3x+4y)\right](\hat{k})$

$\overrightarrow{\mathrm{B}}=-\frac{57}{3\times 10^8}\cos \left[7.5\times 10^6\mathrm{t}-5\times 10^{-3}(3x+4y)\right](\hat{k})$

$\overrightarrow{\mathrm{B}}=-\frac{57}{3\times 10^8}\cos \left[7.5\times 10^6\mathrm{t}-5\times 10^{-3}(3x+4y)\right](5\hat{k})$

$\overrightarrow{\mathrm{B}}=\frac{57}{3\times 10^8}\cos \left[7.5\times 10^6\mathrm{t}-5\times 10^{-3}(3x+4y)\right](5\hat{k})$