Question

Two identical positive charges are placed on the y-axis at

y = – a and y = + a. The variation of V (potential) along x-axis is shown by graph –

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

W = q (V_f – V_i) = – e (V_A – V_B)

W = – 1.6 × 10^–19 (2)0 – (– 20))

= – 1.6 × 10^–19 × 40 = – 6.4 × 10^–18 J