Question

1, (15)Two pont charges of q=0.5 (#N) μC and Q= 2 (#N) pC are placed at x-0 and x-1.2 m. At what point x along the line connecting the two charges is the total electric field due to the two charges equal t。zero? a)39.9cm b)0.621m c)822mm d)0.491 m e) None of these is true 2(15) A certain material with resistance Ro_(#N) Ω is in a room at T-80.7 If the absolute temperature T K of the material is doubled, its resistance also doubles. What is the value for α"(1/°C)? a)0.011 b)0.0022 0.034 "F d)0.0033 e)None of this is true

I need to see the step by step process for #2

Answer 1

Let filed at p the zero kq/x^2 - kQ/(1 - 2 x)^2 + (0.5/x^2) = I/(1 - 2 3)^2 (1 - 2 - x)^2 - 4x^1 1 - 44 + x^2 - 2.4 x 4x^2 3x^1 + 3.4x - 1.44 = 0 x = 0.4 m (-w value nigleted) option (10) x 0.4 reuct can be ture