Physics_2022_midterm_Spring_2008.VA

# Physics_2022_midterm_Spring_2008.VA - Physics 2022 Mid-Term...

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Physics 2022 Mid-Term Spring 2008 NOTE: all units are S.I.U... V. A Name: Student ID place a capital letter in the box to left of each multiple choice problem 1a Consider 3 charges on the x-axis. Q 1 at x = 1, Q 2 at x = 2 and Q 3 at x = 4. If the net force on Q 2 is zero, then Q 3 = _____ Q 1 . 1b For the same charges in 1a, if Q 1 = Q 2 = 1 C their total potential energy in J is ___ (k/3). 2a Consider 4 positive charges at the corners of a square. Q 1 = 1C at (1,1), Q 2 = 1C at (-1,-1), Q 3 = 2 C at (1,-1) and Q 4 =2C at (-1,1). The x component of the electric field E x = ___N/C. 2b For the same charges as in 2a, the electric potential (in volts) at x = 0, y = 0 is ____ (k/ ) 3a Consider a very long cylinder of charge with a radius of 2 meters and a charge density of 4 C/ m 3 . The electric field size one meter away from the central axis of the cylinder is ___ (1/ ). 3b For the same cylinder as in 3a, the difference in potential (in volts) between a point on the axis of the cylinder and a point one meter away from the axis of the cylinder is ____ (1/ ).

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