→B(x,t)=(3×10−8T)ˆjsin[2π(1.5×10−8x−2×1014t)]→B(x,t)=(9×10−8T)ˆksin[2π(1.5×10−6x−2×1014t)]→B(x,t)=(9×10−8T)ˆisin[2π(1.5×10−8x−2×1014t)]→B(x,t)=(9×10−8T)ˆjsin[1.5×10−6x−2×1014t)]