A positive point charge of 3.3 times 10^-7 C at the point (x, y)=(-1.1/2 m, 0 m)

Question

A positive point charge of 3.3 times 10^-7 C at the point (x, y)=(-1.1/2 m, 0 m) is 1.1 m away from a negative point charge of 3.3 times 10^-7 C at (x, y)=(+1.1/2 m, 0 m) on the x-axis. Find the electric field (size and direction) at a point on the y-axis (x, y)=(0 m, 3.5 m) due to the two charges. Select one: 0.00 N/C, since the fields cancel 467.48 N/C, along the y-axis 473.21 N/C, parallel to the x-axis 473.21 N/C, along the y-axis 73.46 N/C, parallel to the x-axis Your are given two concentric spherical metal shells, the smaller shell has a radius of 0.28 m and a surface charge of 9.4 times 10^-8 C and the larger shell has a radius of 0.89 m and a surface charge of -1.0 times 10^-8 on it. Find the electric field at a point 0.42 m from the center of the spheres. Select one: 5306.12 N/C 10790.82 N/C 11362212533.02 N/C 4285.71 N/C 4795.92 N/C

Explanation / Answer

a) E = 2k(Q)0.55/(3.5^2 + 0.55^2)^3/2 = 73.46 N Towards x axis
b) E = Qin/4*pi*epsilon*r^2 = k*Qin/r^2 = 4785.26 N/C

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