ExamsMy practice
Ques. 1JEE Main 2024, 29 January (Evening Shift)
A plane electromagnetic wave of frequency 35 MHz travels in free space along the X-direction. At a particular point (in space and time) E=9.6 j V/m. The value of magnetic field at this point is :
- 9.6 j T
- 3.2 10-8 i T
- 9.6 10-8 k T
- 3.2 10-8 k T
Answer
(4) 3.2 10-8 k T
Solution
B= Ec= 9.63 108=3.2 10-8 T
Direction: E B= v j B= i B= k
B=3.2 10-8 k T
In an EM wave E, B and the direction of travel are mutually perpendicular ( E B along v).
Answer: (4)