how to solve Q 10?? For each pair, if the separation between the particles is in

Question

how to solve Q 10??

For each pair, if the separation between the particles is increased, does the potential energy of the pair increase or decrease? In Fig. 24-28a, what is the potential at point P due to charge Q at distance R from P? Set V = 0 at infinity, In Fig. 24-286, the same charge Q has been spread uniformly over a circular arc of radius R and central angle 40 degree . What is the potential at point P, the center of curvature of the arc? In Fig. 24-28c, the same charge Q has been spread uniformly over a circle of radius R. What is the potential at point P, the center of the circle? Rank the three situations according to the magnitude of the electric field that is set up at P, greatest first.

Explanation / Answer

It depends on magnitude of charges. if both charges are positive or
negative potential energy is positve. if one of the charges in negative potential energy is negative.

a) V = k*Q/R

b) V = k*Q/R

c) V = k*Q/R

because potential is scalar quantity.



Ea>Eb>Ec

in 3rd case E = 0.

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