R12^ is written as u.v leading from charge q2 to charge q1. (1 & 2 are charge q1 and q2 resp.) then why r10^ is leading from q1 to point p in the topic-electric field due to a system of charges

R12^ is written as u.v leading from charge q2 to charge q1. (1 & 2 are

1.	R12^ is written as u.v leading from charge q2 to charge q1. (1 & 2 are charge q1 and q2 resp.) then why r10^ is leading from q1 to point p in the topic-electric field due to a system of charges
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