Phy 112 Final LESSON 8 Exam
Questions & Answers (Grade A+)
A maximum peak in an oscillating magnetic field occurs at some
time t. At the same time t, the electric field will experience
a maximum peak.
a minimum peak.
a zero strength field.
none of the above. -
correct answer ✅a maximum peak.
What is the electric field strength of an EM wave if the peak
intensity of the wave is 5000 W/m2?
1372 W/m2
1.89x106 W/m2
3.76x106 W/m2
1940 W/m2 -
correct answer ✅1372 W/m2
Which of the following is a true statement?
Electric fields direct away from both positive and negative charges.
Electric fields direct towards both positive and negative charges.
Electric fields direct away from positive charges and towards
negative charges.
, Phy 112 Final LESSON 8 Exam
Questions & Answers (Grade A+)
Electric fields direct towards positive charges and away from
negative charges. -
correct answer ✅Electric fields direct away from positive charges
and towards negative charges.
A particular electromagnetic wave has a peak magnetic field
strength of 5 x 10-5 T. What is the average intensity of the
electromagnetic wave?
5.97 x 109 W/m2
2.99 x 105 W/m2
5.97 x 105 W/m2
2.9 x 10-8 W/m2 -
correct answer ✅2.99 x 105 W/m2
Wave intensity is defined as the
energy a wave delivers to a certain area.
rate of energy delivered to a certain area.
amplitude of an electromagnetic wave at a certain area.
field strength of an electromagnetic wave at a certain area. -
correct answer ✅rate of energy delivered to a certain area.
Questions & Answers (Grade A+)
A maximum peak in an oscillating magnetic field occurs at some
time t. At the same time t, the electric field will experience
a maximum peak.
a minimum peak.
a zero strength field.
none of the above. -
correct answer ✅a maximum peak.
What is the electric field strength of an EM wave if the peak
intensity of the wave is 5000 W/m2?
1372 W/m2
1.89x106 W/m2
3.76x106 W/m2
1940 W/m2 -
correct answer ✅1372 W/m2
Which of the following is a true statement?
Electric fields direct away from both positive and negative charges.
Electric fields direct towards both positive and negative charges.
Electric fields direct away from positive charges and towards
negative charges.
, Phy 112 Final LESSON 8 Exam
Questions & Answers (Grade A+)
Electric fields direct towards positive charges and away from
negative charges. -
correct answer ✅Electric fields direct away from positive charges
and towards negative charges.
A particular electromagnetic wave has a peak magnetic field
strength of 5 x 10-5 T. What is the average intensity of the
electromagnetic wave?
5.97 x 109 W/m2
2.99 x 105 W/m2
5.97 x 105 W/m2
2.9 x 10-8 W/m2 -
correct answer ✅2.99 x 105 W/m2
Wave intensity is defined as the
energy a wave delivers to a certain area.
rate of energy delivered to a certain area.
amplitude of an electromagnetic wave at a certain area.
field strength of an electromagnetic wave at a certain area. -
correct answer ✅rate of energy delivered to a certain area.
