Please answer both of these and provide explanation on both problems 1. A metal
ID: 1324418 • Letter: P
Question
Please answer both of these and provide explanation on both problems 1. A metal loop is placed in an external magnetic field as shown in the pictures. The external magnetic field is constant in time. The velocity of the loop is indicated. Which picture shows a scenario in which an induced magnetic field pointing to the left is present? 7. Two electromagnetic waves in vacuum are shown here. Which of the following statements true? a. The wavelength of wave 1 is less than the wavelength of wave b. Both waves have the same average energy density. c. Both waves are traveling in the +x direction. Both waves have the same frequency.
Explanation / Answer
PART 1:
Nature will do everything just to oppose change in flux.
The B-field becomes lesser as you go to the left. Thus, to compensate (oppose change), you must produce a B field to the left.
Thus, the answer is OPTION A. [ANSWER, PART 1]
PART 7.
A is not true because they have the same wavelength as you can see.
B is not true because obviously, case 2 has greater amplitude, hence, greater energy density.
C is not true, as the E and B fields are not identical. Actually, case 1 travels towards +x, case 2 towards -x using Poynting Vector.
D is true! They have the same wavelength, same medium (vacuum), thus, same frequency.
D IS TRUE. [PART 7]