Question

1.

A positive charge of 4.60 C is fixed in place. From a distance of 3.90 cm a particle of mass 6.30 g and charge +3.50 C is fired with an initial speed of 78.0 m/s directly toward the fixed charge. How close to the fixed charge does the particle get before it comes to rest and starts traveling away? Submit Answer Tries 0/20

2.

Answer 1

Answer-I Let q, is fixed charge of a & 92 Let E, 2, is fired towards given: 9,= + 4.60 4c = +4.60 x 10°C 2, = + 3.50 4C = + 3.50X10 °C d= 3.90 cm initial distance between them, let . d= 3.90 cm = 3.90 x 10 m -? m initial beed,v=78 mis

11 Now we have to find the closest distances that 22 will attain from e, , and Ez starts travelling bock initially the system will have electrostatic potential energy + Kinetic energy of 22, and when 22 comes closer to e, at closest distance they will only have electrostatic potential energy , ie The Kinetic energy will gets converted into electrostatic potential energy. total energy point of so using conservation of between initial point and closest distance. 1 2,22 = 21 22 I ml + 2 HTTO urto e-> closest distance

7 9 -12 8.987X10 X 4.60 X 3.50X1O - we ..9,. . 8.987 X 10 X 4.60x 3. Soxlo X6.30 X10 3.90x10? 3 => 19164.6 x 10 + 37.100 18x10 = 144.6907 X10 s 22.874618 = 144.6907210 -3 s=6032538 x 10 m rs 144.6907X10 220874618 answer

- Ans=2 given v= 1026 KV = 1026 x 16v (di) distance from 2. = 18.9 mm 9,= 7.90 x 10' - 9 distance from 22, do 14.5 mm single charge at Potential due to a any point a distanced away is given by vadero 2 The net potential due to these two charges v will be * V = V, + Va Q2 3 1.26 X 10 = urto 457 to 9 -9 3 to 8.987 10x 22 s l2xlo = 8.487 X 10 X 7.90xle - 18.9 x 10 3 14.5 X123

121 3 = 3 1.26x10 = 3.7564709x10 + 10.6197931X10 ) 22 3. 3 => 60.6197931x16?) 22 = - 7:4964709x16" = 22= - 204964709 x 10 0.6197931x10? - q 2y = - 400279101? X10 . C answer

so answers are- 02= 6.32 5 382 x 10m or Timm = lo ml E = 6.32 5382 mm 08 Leo I c'ma lo m7 r= 0.6325382 com -37 10 m m 2 = - 4.0? 791012 X 10 C or 2, = -4.02791012 me [i ime = vö°C]