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Q.

An electromagnetic wave is transporting energy in the negative z direction. At a certain point and certain time the direction of electric field of the wave is along positive y direction. What will be the direction of the magnetic field of the wave at that point and instant?

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a

Positive direction of x

b

Positive direction of z          

c

Negative direction of x

d

Negative direction of y

answer is A.

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Detailed Solution

As, pointing vector S→=E→×H→ 

Given energy transport = negative z direction

Electric field = positive y direction

−k^=+j^×i^

Hence according to vector cross product magnetic field should be positive x direction.

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