The electric field just outside the surface of a hollow conducting sphere of radius 20 cm has a magnitude of 500 N/C and is directed outward. An unknown charge Q is introduced into the center of the sphere and it is noted that the electric field is still directed outward but has decreased to 100 N/C. What is the magnitude of the charge Q?
A. 1.5 nC
B. 1.8 nC
C. 1.3 nC
D. 1.1 nC
E. 2.7 nC
Answer: B
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Three identical particles labeled A, B, and C enter a region of space where the magnetic field points away from the viewer perpendicular to the plane of the paper in the drawing in the next column. The particles’ velocities have the same magnitude and all lie in the plane of the paper, but they have the different directions shown. Which particle experiences the largest magnetic force? Answer A, B, or C, or choose from the answers below.
A.A
B.B
C.C
D. Both A and C.
E. The force magnitude has the same nonzero magnitude for all three particles.
F. The magnetic force on all three particles is zero.
The luminosity of a star allows astronomers to determine the radius and distance of the star.
Answer the following statement true (T) or false (F)
When a strange hadron decays into particles that are not strange, it is a manifestation of the
A. electromagnetic interaction. B. strong interaction. C. weak interaction. D. gravitational interaction.
Water slowly evaporates from your skin.
C. Consistent D. Inconsistent