Answer:
Hello some part of your question is missing below is the missing part
2. Â What is the force on the charged particle if it is now located at the 0V potential difference line? (mN) (hint: The electric field can be obtained as above using the 0V and -10V equipotential lines.)
answer :
1) 0.8 mN
2) 0.8 mN
Explanation:
Given data:
1) Calculate the force on the charged particle
q = 80 ÎŒC , Va = 30v , Vb = 40v, â = 1 m
E = ( Îv ) / â
  = ( Vb - Va ) / â
F = qE
 = 80 ΌC * ( 40 - 30 ) / 1 m
 = 800 ΌC
F = 0.8 mN
2) Calculate the force on the charged particle when it is located at 0V
Va = -10V , Vb = 0V, q = 80 ÎŒC, Â â = 1 m
F = qE
  where E = ( 0 - ( -10 ) / 1 Â
F = 80 ÎŒC * Â ( 0 - ( -10 ) / 1
 = 800 ΌC = 0.8 mN