Homework Answers

A small particle has charge -5.00 uC and mass

2.00 x 10-4 kg. It moves from point A, where the electric poten-

tial is VA = +200 V, to point B, where the electric potential is

VB = +800 V. The electric force is the only force acting on the

particle. The particle has speed 5.00 m/s at point A. What is its

speed at point B? Is it moving faster or slower at B than at A?

A point charge q1, is held stationary at the origin. A second charge q2 is placed at a point a, and the electric potential energy of the pair of charges is −6.4×10 −8J. When the second charge is moved to point b, the electric force on the charge does 4.2×10 −8 J of work. What is the electric potential energy of the pair of charges when the second charge is at point b?

A charge of 28.0 nC is placed in a uniform electric field

that is directed vertically upward and has a magnitude of

4.00 104 V/m. What work is done by the electric force when

the charge moves (a) 0.450 m to the right; (b) 0.670 m upward;

(c) 2.60 m at an angle of 45.0° downward from the horizontal?

Three nano coulombs (nC) are placed at a seperate corner of a square with each side measuring 3cm. The two charges located at opposite vertices are negative, and other given charge is positive. Calculate the force experienced by a fourth 3nC when place at the missing corner. What is it orbital period and what its radial acceleration?