Question

PLEASE, I NEED CORRECT ANSWERS TO ALL THE QUESTION. THEY ARE MULTIPLE CHOICE QUESTIONS. THANK YOU

Problem 10.1(b)
Purpose:
Problem: Far from the source, the magnitudes of the electric and magnetic acceleration fields are related by which expression?:
A. E = c2B B. E = cB C. E = B D. B = cE E. B = c2E

Problem 10.1(c)
Purpose:
Problem: Far from the source, the direction of the threads of an accelerating source is which of the following?
A. along the head line B. along the tail line C. along the ray line D. perpendicular to the head line E. none of the above

Problem 10.2
Purpose:
Problem: In a laser beam, the electric field points upward and the magnetic field points to the east at a fixed time. In what direction is the beam traveling?
A. north B. south C. east D. west E. up F. down

Problem 10.3
Purpose:
Problem: A point charge is traveling along the x-axis in the positive direction. Its speed is slowing down. If a thread is emitted in this process, which of the following is true?
A. the tail line is between the x-axis and the head line. B. the tail line is between the y-axis and the head line. C. the tail line has a small component in the +z direction. D. the tail line has a small component in the –z direction

Problem 10.4(a)
Purpose:
Problem: A wire carries current along the +x axis. The current is decreasing in time. At a point P along the +y axis the acceleration electric field points in which direction?
A. +x B. –x C. +y D. –y E. +z F. –z

Problem 10.4(b)
Purpose:
Problem: A wire carries current along the +x axis. The current is decreasing in time. At a point P along the +y axis the acceleration magnetic field points in which direction?
A. +x B. –x C. +y D. –y E. +z F. –z

Problem 10.5(a)
Purpose:
Problem: Electric charge is the source of which of the following?
A. electric field with divergence B. electric field with curl C. magnetic field with divergence D. magnetic field with curl

Problem 10.5(b)
Purpose:
Problem: Changing magnetic fields are the source of which of the following?
A. electric field with divergence B. electric field with curl C. magnetic field with divergence D. magnetic field with curl

Problem 10.5(c)
Purpose:
Problem: Faraday's Law describes which of the following?
A. divergence of electric field B. curl of electric field C. divergence of magnetic field D. curl of magnetic field

Problem 10.5(d)
Purpose:
Problem: Ampere's Law describes which of the following?
A. divergence of electric field B. curl of electric field C. divergence of magnetic field D. curl of magnetic field

Problem 10.5(e)
Purpose:
Problem: Displacement current is which of the following?
A. the current that is displaced from normal current when a circuit is shifted. B. the current in a displacement inductor. C. a constant times the derivative of the electric flux with respect to time. D. a constant times the derivative of the magnetic flux with respect to time.

Answer 1

10.1(b) Far from the source, the magnitudes of the electric and magnetic acceleration fields are related by which expression?:

• Ans is (B) E = cB
• far from source, B= E / c, so E=cB

10.1(c) Far from the source, the direction of the threads of an accelerating source is which of the following?

• Ans is (D). perpendicular to the head line
• As the thread moves far from the source, its direction becomes perpendicular to the head line

10.2 In a laser beam, the electric field points upward and the magnetic field points to the east at a fixed time. In what direction is the beam traveling?

• Ans is (B) south
• electric field and magnetic field are perpendicular to each other and direction of travelling wave is also perpendicular so wave travelling in z direction which is in south direction.

10.3 A point charge is traveling along the x-axis in the positive direction. Its speed is slowing down. If a thread is emitted in this process, which of the following is true?

• Ans is (B) the tail line is between the y-axis and the head line
• For Slowing Down: the tail line is between the y-axis and the head line
• Speeding Up: the tail line is between the x-axis and the head line