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Q.

A plane electromagnetic wave travels in free space along X-direction. If the value of B→ (in tesla) at a particular point in space and time is 1.2×10−8k , the value of  E→(in Vm−1)  at that point is

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a

1.2j^

b

3.6k^

c

1.2k^

d

3.6j^

answer is D.

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Detailed Solution

The magnitude of E→ is given by

E=Bc=(1.2×10−8T)(3×108ms−1)=3.6Vm−1

Since  (+j^)×(+k^)=i^,E→ is along the Y-direction.  

Thus  E→=3.6j^Vm−1

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