Question

Figure shows two equipotential lines in x, y plane for an electric field. The scales are marked. The x-component E_x and y-component E_y of the field in the space between these equipotential lines are respectively-

• A.
  • 100 V/m, –200 V/m
• B. – 100 V/m, +200 V/m
• C.
  • 200 V/m, +100 V/m
• D. – 200 V/m, –100 V/m

Answer 1

Answer: (D)

– 200 V/m, –100 V/m

Answer 2

Work done by external source

W_ext = q(V_F – V_i), 20 = 4(V – 10); V = 15 volt.