The magnetic field in a plane electromagnetic wave is given by: `By=12 xx 10^(-8) sin (1.20 xx 10^7z+3.60 xx 10^(15)t)T.` Calculate the
Energy density associated with the Electromagnetic wave.

Explanation

To calculate the energy density associated with the electromagnetic wave given the magnetic field, we will follow these steps:

### Step 1: Identify the given magnetic field
The magnetic field is given by:
\[ B_y = 12 \times 10^{-8} \sin(1.20 \times 10^7 z + 3.60 \times 10^{15} t) \, \text{T} \]

### Step 2: Use the formula for energy density associated with the magnetic field
The energy density \( u \) associated with the magnetic field is given by the formula:
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