1)Four identical point charges (+3.61nC) are placed at the corners of a rectangl

Question

1)Four identical point charges (+3.61nC) are placed at the corners of a rectangle, which measures 2.00m by 5.00m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?

2)A charge Q=+4.57?C is uniformly distributed on a thin cylindrical plastic shell. The radius, R, of the shell is R=3.23cm. Calculate the electric potential at the origin of the xy?coordinate system shown in the figure. Assume that the electric potential is zero at points infinitely far away from the origin.

Explanation / Answer

1.) r = sqrt(1^2 + 2.5^2) = 2.693 m

V = 4*k*Q/r = 4*9x10^9*3.61x10^-9/2.693 = 48.26 Volts

2.) V = k*Q/R = (9x10^9)(4.57 x 10^-6)/0.0323 = 1273374.6 Volts

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