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Out of electric field vector, vec(E) and...

Out of electric field vector, `vec(E)` and magnetic field vector, vec(B)` in an electromagnetic wave, which is more effective and why ?

A

`vec(E)`

B

`vec(B)`

C

Both `vec(E)` and `vec(B)`

D

neither `vec(E)` nor `vec(B)`

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The correct Answer is:
A
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