Shown below is an equipotential diagram for 3 charged spheres of various radii.

Question

Shown below is an equipotential diagram for 3 charged spheres of various radii. a) What is the sign of the charge on Q 1 ? Q 2 ? Q 3 ? b) Among points b, j, k, and m, where is the electric field strength the greatest? c) List all pairs of points that are at the same potential (or very nearly so). d) Draw representative electric field lines for this charge distribution , (about) 6 lines per sphere. (Assume each charge is uniformly spread over the surface o f the sphere, which is represented by the 3 large circles.

Explanation / Answer

a) Q1 is negative

Q2 is negative

Q3 is positive

b) electric field strength is greatest at m as the density of lines s realtively greater at m

c) b,d and k,g

d) draw lines perpendicular to the equipotential lines at the charges pointing towards the negative charges and away from positive charges

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