At a Certain Point and a Certain Time the Electric

question 56

Multiple Choice

At a certain point and a certain time the electric field of an electromagnetic wave is in the negative z direction and the magnetic field is in the positive y direction. Which of the following statements is true?

• A) Energy is being transported in the positive x direction but half a cycle later, when the electric field is in the opposite direction, it will be transported in the negative x direction
• B) Energy is being transported in the positive x direction and half a cycle later, when the electric field is in the opposite direction, it will still be transported in the positive x direction
• C) Energy is being transported in the negative x direction but half a cycle later, when the electric field is in the opposite direction, it will be transported in the positive x direction
• D) Energy is being transported in the negative x direction and half a cycle later, when the electric field is in the opposite direction, it will still be transported in the negative x direction.
• E) None of the above are true.

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Definitions:

Root

The basic part of a word, carrying its core meaning, from which other words can be formed by adding prefixes or suffixes.

Na:

Symbol for Sodium, a chemical element with atomic number 11, essential for living organisms.

AD

Can stand for Anno Domini (in the year of our Lord), Alzheimer's disease, or, in medical prescriptions, it often refers to the right ear, from "auris dextra."

HSG

Hysterosalpingography, a radiographic procedure to examine the uterus and fallopian tubes often used in infertility diagnosis.