Phy 112
Hwk 2
Name:___________________
y-axis (m)
1. Three identical particles are shown below. Each particle has 50C of charge
a. Find the net force (magnitude and direction) on each particle.
(ans: 2.66N@110°, 1.51N@13.1°, 2.90N@259°)
x-axis (m)
1
Phy 112
Hwk 2
Name:___________________
2. Three identical point charges, each of mass m = 0.100kg, hang from three strings, as
shown. The lengths of the left and right strings are each L = 25.0 cm, and the angle is
35.0°
a. Solve for the tension in one of the outside strings. (ans: 0.6862N)
b. determine the value of q on the charges. (ans: 68.1C)
2
Phy 112
Hwk 2
Name:___________________
3. A charged block stays at rest on an incline of 50.0° because an electric field is
directed up the ramp. The coefficient of friction between the block and the mass
is 0.400. The block carries a charge of 1.99mC and the E-field is 3.33x103N/C.
a. Solve for the normal force on the block (ans:
)
b. Solve for the maximum mass of the block that will keep it at rest. (ans:
1.33kg)
E
3