blems 18-8, 007 10.0 points The magnitude of a uniform electric field be- tween the two plates is
about 2 x 105 N/C. k set If the distance between these plates is These 0.1 em, find the potential
difference bet ween nd/or the plates. ot be Answer in units of V efore 008 10.0 points s willTwo
charges are located along the r-axis. One blems has a charge of 6.3 C, and the second has a
charge of-3.5 ?(. If the eleetrical potential energy associ- ated with the pair of charges is 0.038 J.
celerwhat is the distance between the charges? rence The value of the Coulomb constant is
8.98756 x 109 N·m2/C2 and the acceleration due to gravity is 9.sI m/s Answer in mits of
Solution
7) For parallel plates,
V = E * d
where V is the potential difference, d is the separation, and E is the electric field
V = 2e5 * 1e-3
V = 200 volts
8) We know that potential energy for system of two charges is given as
U = kq1q2 / r
where r is the distance between two charges , k is coulomb's constant
- 0.038 = 8.98756e9*6.3e-6*-3.5e-6 / r
r = -8.98756e9*6.3e-6*-3.5e-6 / - 0.038
r = 5.215 m