A charge of 1.0 × 10-6 ?C is located inside a sphere, 1.25 cm from its center. What is the electric flux through the sphere due to this charge? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 0.028? N ? m2/C
B) 0.11 N ? m2/C
C) 8.9 N ? m2/C
D) It cannot be determined without knowing the radius of the sphere.
B
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Flux: A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width w is 0.040 m. What is the magnetic flux through the loop when the plane of the loop is parallel to the magnetic field?
A. 13 × 10-3 T ? m2 B. 2.6 × 103 T ? m2 C. 0.80 T ? m2 D. 2.6 × 10-3 T ? m2 E. 0 T ? m2
A walker walks 30 m from the origin toward the EAST to point A. She then walks from point A 20 m more toward the WEST to point B. The walker's total displacement form the origin is
A. 50 m toward the EAST. B. 30 m toward the WEST. C. 20 m toward the WEST. D. 10 m toward the EAST. E. 10 m toward the WEST.
A barbell is easier to twist when its weights are
a. close to the axis of rotation b. near the ends of the bar c. heavy d. light e. none of the above
Energy Levels: In a hydrogen atom, the electron makes a transition from the n = 8 to the n = 3 state. The wavelength of the emitted photon is closest to which one of the following values? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 9.57 × 10-7 m B. 1.13 × 10-6 m C. 3.12 × 10-7 m D. 4.52 × 10-6 m E. 6.34 × 10-7 m