The Electromagnetic Wave of the Radiation Field from a Wire

question 40

Multiple Choice

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction) . At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10^-8 T. The frequency of the wave is 1.0 × 10¹⁶ Hz.
-What is the intensity of the electromagnetic wave at time t = 0 s?

• A)0.24 W/m²
• B)0.38 W/m²
• C)0.48 W/m²
• D)0.76 W/m²
• E)24 W/m²

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Definitions:

Short-run Marginal Cost Curve

A curve that shows the change in total cost associated with producing one more unit of output in the short term.

Diminishing Marginal Returns

A principle that states as additional units of a variable input are added to fixed inputs, the additional output produced from each new unit eventually decreases.

Variable Resources

Inputs that change in quantity with levels of production, such as raw materials and labor.

Variable Cost

Costs that change in proportion to the level of goods or services that a business produces.