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CBSE Class 12 Physics 2017 Delhi Set 1 Paper

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Question : 5 of 26
Marks: +1, -0
How is the speed of em-waves in vacuum determined by the electric and magnetic fields?
Solution:  
Speed of em-waves is determined by the ratio of the peak values of electric and magnetic field vectors.
[Alternatively, Give full credit, if student writes directly C=‌
E0
B0
 ]
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