A proton moving in a region of a space does not experience any acceleration in the direction of motion. Which of the following statements is correct with respect to this situation?
A) The electric and magnetic fields must be perpendicular to each other in that region.
B) The electric and magnetic fields must be parallel to each other in that region.
C) Both electric and magnetic fields must be zero in that region.
D) The electric field must be zero but not the magnetic field in that region.
E) The magnetic field must be zero but not the electric field in that region.
D
You might also like to view...
Mass on a Spring: A 3.7-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 450 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. The maximum elastic potential energy of the system is closest to
A. 1.4 J. B. 1.3 J. C. 1.6 J. D. 1.7 J. E. 1.8 J.
A physical pendulum is composed of a sphere whose center of gravity is attached to a thin rod. The sphere has a moment of inertia of 2/5 
The mass of the sphere is 2.00 kg and has a radius of 30.0 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 2.45 sec. B. 2.02 sec. C. 1.98 sec. D. 1.52 sec. E. 1.25 sec.
A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?
A. 8.1 N down the incline B. 3.0 N down the incline C. 2.1 N up the incline D. 3.0 N up the incline E. 8.1 N up the incline
The form of radiation from naturally radioactive uranium that has the largest mass is ________ rays.
Fill in the blank(s) with the appropriate word(s).