Question

In an electromagnetic wave, the average energy density associated with magnetic field is:

• A. \( L_i^2 / 2 \)
• B. \( B^2 / 2\mu_0 \)
• C. \( y^2 B^2 / 2 \)
• D. \( B^2 / \mu_0 \)

Hint:

The energy density in an electromagnetic wave is shared between the electric and magnetic fields.

Answer 1

The Correct Option is B

Step 1: Formula for energy density.
The energy density associated with the magnetic field in an electromagnetic wave is given by: \[ u_B = \frac{B^2}{2\mu_0} \] where \( B \) is the magnetic field strength and \( \mu_0 \) is the permeability of free space.
Step 2: Explanation.
This formula gives the energy density in the magnetic field component of an electromagnetic wave.
Final Answer: \[ \boxed{\frac{B^2}{2 \mu_0}} \]