Question

Two small spheres assumed to be identical conductors are placed at 30 cm from each other on a horizontal axis. the first S1 is loaded with 12 nC and the second S2 is loaded with -18 nC. make a figure where you need representative.1) determine the electric force exerted by S1 on S2b) determine the electric field created by S1 at the level of s2c) determine the electric potential created by s1 at the level of s2d) determine the electric force exerted by S2 on S1e) determine the electric field created by s1 in the middle of [S1: S2]f) determine the electric field in the middle of [S1: S2]g) determine the electric potential in the middle of [S1: S2]h) determine the electric potential at the level of S1

Answer 1

When they are connected by a conducting wire, finally charge on each will be half of total charge on both. Let q be the final charge on each, then

q=$12-18\over 2$ =-3nC

Using Coulomb's law, F=$\frac{1×q^2}{4\pi \epsilon _o×r^2}$ =$(9×10 ^9 )× \frac{ (3×10 −9 ) ^ 2}{(0.3)^2} ​ =9×10 ^{−7} N$