1. Three charges are arranged as shown. a. The magnitude of the electric field at point P due to one of the +Q charges is E. What is the magnitude of the net electric field at P? Write answer in terms of E and/or 0 only. 2.Three charges are on a line as shown. An electron (charge -e, mass m) is released from rest at point A. We want to determine how fast the electron is moving at point B. -Z W +Q O-. L 0 b. The electric potential at point P due to one of the +Q charges is V. What is the net voltage at point P? Take V = 0 at infinity. Write answer in terms of V, and/or 8 only. A +Q 0 L ‒‒‒‒‒‒ -P------ 2L-- W b. Use conservation of energy to determine the speed of the electron a point B. B 1 W +Z W a. A common mistake is to calculate the electric force on the electron at point A and then use Newton's 2nd law and constant acceleration kinematics to find the speed of the electron at point B. Why won't this work? -3Q -2Z

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Chapter1: Units, Trigonometry. And Vectors
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After this activity you should know: Be able to recognize when to use electric fields and when to use electric
potential.
1. Three charges are arranged as shown.
a.
The magnitude of the electric field at point due to one
of the +Q charges is Eo. What is the magnitude of the
net electric field at P? Write answer in terms of E
and/or 0 only.
2.Three charges are on a line as shown. An
electron (charge -e, mass m) is released
from rest at point A. We want to
determine how fast the electron is moving
at point B.
-Z
W
+Q
A
+Q
b. The electric potential at point P due to one of the +Q charges is V. What is the net voltage at point P?
Take V = 0 at infinity. Write answer in terms of V, and/or only.
Ꮎ
0 L
‒‒‒‒‒‒
L
W
b. Use conservation of energy to determine the speed of the electron a point B.
B
1
2L-
W
+Z
W
a.
A common mistake is to calculate the electric force on the electron at point A and then use Newton's 2nd
law and constant acceleration kinematics to find the speed of the electron at point B. Why won't this
work?
-3Q
-2Z
Transcribed Image Text:After this activity you should know: Be able to recognize when to use electric fields and when to use electric potential. 1. Three charges are arranged as shown. a. The magnitude of the electric field at point due to one of the +Q charges is Eo. What is the magnitude of the net electric field at P? Write answer in terms of E and/or 0 only. 2.Three charges are on a line as shown. An electron (charge -e, mass m) is released from rest at point A. We want to determine how fast the electron is moving at point B. -Z W +Q A +Q b. The electric potential at point P due to one of the +Q charges is V. What is the net voltage at point P? Take V = 0 at infinity. Write answer in terms of V, and/or only. Ꮎ 0 L ‒‒‒‒‒‒ L W b. Use conservation of energy to determine the speed of the electron a point B. B 1 2L- W +Z W a. A common mistake is to calculate the electric force on the electron at point A and then use Newton's 2nd law and constant acceleration kinematics to find the speed of the electron at point B. Why won't this work? -3Q -2Z
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