Consider a pulse of plane electromagnetic wave whose electric field is in y direction and is propagating in +x direction. The electric field at x = 0 varies as shown in the graph. Choose the correct graph (s) for electric field and magnetic field as x and t.

Question

G1 Physics · Accepted Answer

A pulse propagating along +x obeys E(x,t)=E(0,t-x/c), so the waveform at larger x is the same shape delayed in time. With E along +y, B is along +z and B=E/c. Applying both conditions to the graphs makes Images 1, 2 and 3 correct. Correct: A,B,C.