A) A physics instructor in an anteroom charges an electrostatic generator to 25u

Question

A) A physics instructor in an anteroom charges an electrostatic generator to 25uC, then carries it into the lecture hall. Find the net electric flux, in Nm^2/C, through the lecture hall walls.

B) A particle with charge is placed at the corner of a cube.Find the total electric flux, in Nm^2/C, through all sides of the cube.

C) A cylinder plastic (non-conducting) wastepaper basket, with a 0.15m radius opening, is in a uniform electric field of 300N/C, perpendicular to the opening. Find the total flux through the sides and bottom, in Nm^2/C.

Explanation / Answer

A) the electric flux , = q/_0          where q = charge , _0 = permittivity of space ( 8.85*10^-12 c^2/N.m^2 ).       = 25*10^-6 / 8.85*10^-12              = 2.824 *10^6 Nm^2/C B) the effective charge on the cube is q' = 25*10^-6/8 the flux through the cube, = 3.125*10^-6 /8.85*10^-12                                              = 0.353*10^6 Nm^2/C

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