الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Lectures in General Physics
[24] A solid conducting sphere of radius 2.00 cm has a charge of 8.00 C. A
conducting spherical shell of inner radius 4.00 cm and outer radius 5.00 cm
is concentric with the solid sphere and has a charge of -4.00 C. Find the
electric field at r = 7.00 cm from the center of this charge configuration.
a. (2.20 10 7 N/C)r
b. (4.32 10 7 N/C)r
c. (7.34 10 6 N/C)r
d. (1.44 10 7 N/C)r
[25] The electric field everywhere on the surface of a thin spherical shell of
radius 0.650 m is measured to be equal to 790 N/C and points radially
toward the center of the sphere. (a) What is the net charge within the sphere's
surface? (b) What can you conclude about the nature and distribution of the
charge inside the spherical shell?
a. (a) 3.7110 -8 C; (b) The charge is negative, its distribution is
spherically symmetric.
b. (a) 3.71 10 -8 C; (b) The charge is positive, its distribution
is uncertain.
c. (a) 1.9310 -4 C; (b) The charge is positive, its distribution is
spherically symmetric.
d. (a) 1.9310 -4 C; (b) The charge is negative, its distribution
is uncertain.
[26] Four identical point charges (q = +16.0 C) are located on the corners
of a rectangle, as shown in Figure 6.
q
q
W
q
L
Figure 6
q
The dimensions of the rectangle are L 70.0 cm and W= 30.0 cm. Calculate
the electric potential energy of the charge at the lower left corner due to the
other three charges.
a. 14.9 J
Dr. Hazem Falah Sakeek 117