Question
A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, then Q q equals:
BITSAT
Physics
Electrostatics
2021
BITSAT 2021
BITSAT Physics Question (2021) — Solution
Options
- A. -1
- B. 1
- C. - 1 2
- D. -2 2
Answer
D. -2 2
Step-by-step solution
It is given that F _ A + F _ B + F _ D =0 Where F _ A , F _ B and F _ D are the forces applied by charges placed at A, B and D on the charge placed at C. array l F _ B + F _ D =- F _ A \\ | F _ B + F _ D |= 2 KqQ a ^ 2 \\ | F _ A |= KQ ^ 2 2 a^ 2 \\ 2 KqQ a^ 2 =- KQ ^ 2 2 a^ 2 \\ Q q =-2 2 array
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