Physics · Electric field: electric field due to a point charge, electric field lines, electric dipole, electric field due to a dipole, torque on a dipole in a uniform electric field
Assertion Three equal charges are situated on a circle of radius r such that the
Assertion Three equal charges are situated on a circle of radius r such that they form on equilateral triangle, then the electric field intensity at the centre is zero Reason The force on unit positive charge at the centre, due to the three equal charges are represented by the three sides of a triangle taken in the same order Therefore, electric field intensity at centre is zero
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but Reason is correct
Step-by-step solution
Three equal charges placed symmetrically at the vertices of an equilateral triangle produce equal-magnitude electric field vectors at the center, each directed radially outward (or inward). These vectors are spaced 120° apart, so their vector sum is zero. The Reason correctly describes this vector addition as three sides of a triangle taken in order, which sums to zero. Hence, both Assertion and Reason are true, and Reason correctly explains Assertion.
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