An electromagnetic wave traveling in the -x direction in vacuum has a frequency 2x1014Hz. The electric field in the wave has maximum value of 2 V/m. If we define the time and position such that the electric field has maximum value at position x=0 at time=0, a possible equation describing the electric field is:
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a. ?=(2V/m)sin[(4.2x106 /m)x-(1.3x1015Hz)t]?̂
"⃗ ' b. ?=(2V/m)cos[(4.2x106 /m)x+(1.3x1015Hz)t]?
"⃗ ' c. ?=(1V/m)sin[(1.3x1015 /m)x-(4.2x106Hz)t]?
"⃗
d. ?=(4V/m)cos[(4.2x106 /m)x+(1.3x1015Hz)t]?̂
2.
Option B is the right answer
Substituting x=0, t=0 in the options should give the maximum value of electric field which is given as 2 V/m. Only option B satisfies this condition.
An electromagnetic wave traveling in the -x direction in vacuum has a frequency 2x1014Hz. The electric...
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