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# PHY101 Physics Assignment 3 Solution Fall 2012

Question # 1
(a)What is the electric field at the location of the test charge shown below? And what is the direction of electric field?

(b) What are the magnitude and direction of the electric field at point A shown below? Marks = 6
Question # 2
Find the force on the electron in figure shown below and also determine the acceleration of
electron? Mention the direction of force and acceleration as well.
Note that mass of electron is 9.1×10-31kg, and the value of charge on electron is (-1.6×10-19 C)
Marks = 7
Question # 3
Is it true to say that electric field lines are the same as electric field vectors. If yes give an
example if not explain it. Marks = 6
Question # 4
Suppose you increased the amount of the charge of a test charge, and the force exerted on it
changed. This means the field you were assessing must have changed. Marks = 5
Question # 5
(a) It takes 10.0 J of work by the right-hand wand to separate the charges as shown in figure.
What is the change in potential energy? Marks = 3
Physics (PHY101) VU of Pakistan
(b) Is it true to say that electric potential energy and electric potential are the same?
Either yes or no explain in each case. Marks = 3

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