In a plane electromagnetic wave propagating along the -direction, the electric field oscillates along the -axis. Along which axis does the magnetic field oscillate?
Answer and explanation
Correct answer: C. Along the -axis
- Step 1: Electromagnetic waves are transverse: the electric field , magnetic field , and propagation direction are mutually perpendicular, satisfying .
- Step 2: With and , we require , which gives (along the -axis).
Answer
Along the -axis.
Why not the others: Along the -axis violates the transverse nature; along is parallel to the electric field; and is not mutually orthogonal.
Practise more Electrostatics and Electromagnetism.
Free questions with an explanation for every one, and full timed CBSE Class 12 mock tests.
More Electrostatics and Electromagnetism questions
- Two point charges placed in vacuum repel each other with a force of . If they are placed at the same separation in a dielectric medium of…
- For a short electric dipole of dipole moment , how does the magnitude of the electric field at a distance along its axial line vary w…
- A point charge is situated at the exact geometric center of a closed cube of side . What is the total electric flux passing through o…
- A parallel plate capacitor of capacitance is charged by a battery to potential and then disconnected from the battery. A dielect…
- If the potential difference applied across a metallic wire of length is doubled while keeping its temperature constant, what happens to…
- In a balanced Wheatstone bridge network, the four arms have resistances , , , and . What…