The given figure shows an equilateral triangle ABC. A positive point charge |q is located at each of the three vertical A, B and C. each side of the triangle is of length a. A point charge Q (that may be positive or negative) is placed at the mid-point between B and C. Is it possible to choose the value of Q (that is non-zero) such that the force on Q is zero ? Explain why or why not.

The given figure shows an equilateral triangle ABC. A positive point c

1.	The given figure shows an equilateral triangle ABC. A positive point charge \|q is located at each of the three vertical A, B and C. each side of the triangle is of length a. A point charge Q (that may be positive or negative) is placed at the mid-point between B and C. Is it possible to choose the value of Q (that is non-zero) such that the force on Q is zero ? Explain why or why not.
Answer» Yes, because the FORCES on Q are vector and three vectors can add to ZERO No, because the forces on q are vectors and three vectors can never add to zero Yes, because the ELECTRIC force at the mid-point between B and C is zero whether a charge is placed there or not. No, because a fourth charge would be needed cancel the force on Q DUE to the charge at A. Answer :D

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