Question

Two concentric imaginary spherical surfaces of radius R and 2R respectively surround a positive point charge -Q located at the center of the surfaces. When compared to the electric flux ??1 through the surface of radius R, the electric flux ??2 through the surface of radius 2R is a. ??2 = 1/4 ??1. b. ??2 = 1/2 ??1. c. ??2 = ??1. d. ??2 = 2??1. e. ??2 = 4??1. ANS: C PTS: 1 DIF: Easy When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is L = ?(4/3)r. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ??sphere at the spherical surface to the flux ??cube at the surface of the cube is a. 4/3. b. ?(4/3). c. 1. d. ?(3/4). e. 3/4. ANS: C PTS: 1 DIF: Easy

          Two concentric imaginary spherical surfaces of radius R and 2R respectively surround a positive point charge -Q located at the center of the surfaces. When compared to the electric flux ??1 through the surface of radius R, the electric flux ??2 through the surface of radius 2R is
a. ??2 = 1/4 ??1.
b. ??2 = 1/2 ??1.
c. ??2 = ??1.
d. ??2 = 2??1.
e. ??2 = 4??1.
ANS: C
PTS: 1
DIF: Easy
When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is L = ?(4/3)r. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ??sphere at the spherical surface to the flux ??cube at the surface of the cube is
a. 4/3.
b. ?(4/3).
c. 1.
d. ?(3/4).
e. 3/4.
ANS: C
PTS: 1
DIF: Easy

Two concentric imaginary spherical surfaces of radius R and 2R respectively surround a positive point charge -Q located at the center of the surfaces. When compared to the electric flux ??1 through the surface of radius R, the electric flux ??2 through the surface of radius 2R is
a. ??2 = 1/4 ??1.
b. ??2 = 1/2 ??1.
c. ??2 = ??1.
d. ??2 = 2??1.
e. ??2 = 4??1.
ANS: C
PTS: 1
DIF: Easy
When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is L = ?(4/3)r. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ??sphere at the spherical surface to the flux ??cube at the surface of the cube is
a. 4/3.
b. ?(4/3).
c. 1.
d. ?(3/4).
e. 3/4.
ANS: C
PTS: 1
DIF: Easy

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