SP212/3321&5521
Chapter 24 - Worksheet #1
Question 1: A negatively charged particle is moving in a direction parallel to the electric field. Is
the particle moving to higher or lower potential? Is it moving to higher or lower potential energy?
Is the particle speeding up or slowing down?
~
E
−
~v
Question 2: Two point charges, with q1 =+0.10 C and q2 = −0.10 C, both have initial kinetic energies
of Ki =5.0 J when they are located at a position with electric potential Vi =0 V. Both charges move
to a position where the electric potential is Vf =25 V. What is the kinetic energy of each charge when
they reach this final position?
Question 3: A one-dimensional electric field along the x-axis is given by Ex (x) = 2.5 − 1.2x, where
Ex has units of V/m when x has units of meters. If the electric potential at x=0 is defined to be
+1.2 V, what is the electric potential at x=3.0 m? If a charge with q=+0.080 C is released from
rest at x=0, what is its kinetic energy when it reaches x=3.0 m?
SP212/3321&5521
Chapter 24 - Worksheet #1
~ = (−2.0î − 1.6ĵ) V/m. If the electric potential
Question 4: A uniform electric field is given by E
at the origin [at (x, y)=(0,0)] is defined to be 0 V, what is the electric potential at (x, y)=(0.60 m,
0.50 m)?
Question 5: Two point charges (+7.0 µC and −3.0 µC) are placed as shown. (a) What is the
magnitude of the electric field at point P ? (b) What is the electric potential at point P ? (We’ll
define the potential to be zero infinitely far away.)
y
−3.0 µC
0.75 m
P
0.45 m
x
+7.0 µC
Question 6: Two point charges (−3.0 µC and −4.0 µC) are placed as shown, 0.60 m apart. Point P
is between the two charges, 0.40 m away from the 3.0 µC charge. (a) What is the magnitude of the
electric field at point P ? (b) What is the electric potential at point P ? (We’ll define the potential
to be zero infinitely far away.)
0.40 m
−3.0 µC
0.20 m
P
−4.0 µC