Two point charges q2 = 3 x 10-6C and q1 = 5 x 10-6 C are located at (3 ,5,1,) and (1,3,2) m .

find F12and F21 using vector form of coulomb 's law . Also, find their magnitude.

Here, q2 = 3 X 10-6 C, q1 = 5 X 10-6 C
​vector r2 = 3 i^ +5j + k^ 
vector r​1 i^ + 3j + 2k
 r12 = r2 - r1 = (2 i^ + 2j -k)^r12 =22 + 22 + (-1)2 = 3 m
r12^ = r12r12 =2 i^ + 2j^ -k^3


F21 = kq1q2r212  r12^  = (9 X 109) (5 X 10-6) (3 X 10-6) 32 X (2 i^ + 2 j^ -k^)3
F21 =5 X 10-3 (2 i^ + 2j^ - k^) NF21 = [22 + 22 +(-1)2]  5 X 10-3           = 1.5 X 10-2 NF12 = -F21 = -(5 X 10-3) (2 i^ + 2j^ - k^) N
 

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