الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Lectures in General Physics
m
k
m
m
k
m
a
b
Figure 2
A charge Q is slowly placed on the system causing the spring to stretch to an
equilibrium length of 0.460 m as in Figure 2b. Determine the value of Q,
assuming that all the charge resides in the blocks and that the blocks can be
treated as point charges.
a. 64.8 C
b. 32.4 C
c. 85.1 C
d. 42.6 C
[5] A small plastic ball 1.00 g in mass is suspended by a 24.0 cm long string
in a uniform electric field as shown in Figure P23.52.
y
x
23 o
24cm
E=1.5x10 3 i N/C
m=1g
Figure 3
If the ball is in equilibrium when the string makes a 23.0 o angle with the
vertical, what is the net charge on the ball?
a. 36.1 C
b. 15.4 C
c. 6.5 3 C
d. 2.77 C
[6] An object having a net charge of 24.0 C is placed in a uniform electric
field of 6 10 N/C directed vertically. What is the mass of the object if it
"floats" in the field?
Dr. Hazem Falah Sakeek 111