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BITSAT Physics Electrostatics 2023 BITSAT 2023 (Memory Based Paper 1)

BITSAT Physics Question (2023) — Solution

Question

The force between two small charged spheres having charges of 1 10^ -7 C and 2 10^ -7 C placed 20 ~cm apart in air is

Options

  1. A. 4.5 10^ -2 ~N
  2. B. 5.4 10^ -2 ~N
  3. C. 4.5 10^ -3 ~N
  4. D. 5.4 10^ -3 ~N

Answer

C. 4.5 10^ -3 ~N

Step-by-step solution

Here, q_1=1 10^ -7 C , q_2 and 2 10^ -7 C , r=20 ~cm =20 10^ -2 ~m F= q_1 q_2 4 _0 r^2 = 9 10^9 1 10^ -7 2 10^ -7 (20 10^ -2 )^2 =4.5 10^ -3 N

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