- #1

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The E field of an EM wave is defined as E(x, y, z, t) = E

_{0}sin(kx - wt)y_hat and the B field of an EM wave is defined as B(x, y, z, t) = B

_{0}sin(kx - wt)z_hat.

Why is there a minus sign in front of the wt term? I understand how kx (the offset in space) is positive; why wouldn't the time offset (wt) also be positive in this equation?

Thanks!

-Max