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EE140 Mid Term 1 Dr Ray Kwok Print Name 1 A uniformly charged disc with radius R is placed at a distance d above an infinite ground plane a What is the electric field at a distance z d above the ground plane along the z axis b Using the definition of V E d find the electric potential at the same location z above the ground plane c What is the capacitance of this configuration disc above the ground plane z d O EE140 2 Mid Term 1 Dr Ray Kwok An infinitely long thin sheet with width W is bent into a semi circle The total current I uniformly distributed along the curve is coming out of the page as shown Find the magnetic field vector at the origin in terms of I and W only y o x EE140 3 Mid Term 1 Dr Ray Kwok A line charge of length L along the z axis from z L 2 to L 2 has a linear charge density of z What is the electric potential and electric field intensity at a distance x away from the center x 0 0