CHARLES AUGUSTIN DE COULOMB (1736 –1806)
Chapter 1: Chapter 1 · PHYSICS PART-1 · EN medium
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Since force is a vector, it is better to write Coulomb’s law in the vector notation. Let the position vectors of charges q1 and q2 be r1 and r2 respectively [see Fig. . (a)]. We denote force on q1 due to q2 by F12 and force on q2 due to q1 by F21. The two point charges q1 and q2 have been numbered and for convenience and the vector leading from to is denoted by r21: r21 = r2 – r1 In the same way, the vector leading from to is denoted by r12: r12 = r1 – r2 = – r21 The magnitude of the vectors r21 and r12 is denoted by r21 and r12, respectively (r12 = r21). The direction of a vector is specified by a unit vector along the vector.
📖 NCERT Class 12 Physics Part 1 · Page 15
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Since force is a vector, it is better to write Coulomb’s law in the vector notation. Let the position vectors of charges q1 and q2 be r1 and r2 respectively [see Fig. . (a)].
We denote force on q1 due to q2 by F12 and force on q2 due to q1 by F21. The two point charges q1 and q2 have been numbered and for convenience and the vector leading from to is denoted by r21: r21 = r2 – r1 In the same way, the vector leading from to is denoted by r12: r12 = r1 – r2 = – r21 The magnitude of the vectors r21 and r12 is denoted by r21 and r12, respectively (r12 = r21). The direction of a vector is specified by a unit vector along the vector. To denote the direction from to (or from to ), we define the unit vectors: ˆ = r , ˆ ˆ ˆ , Coulomb’s force law between two point charges q1 and q2 located at r1 and r2 is then expressed as ˆ o
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