Question : Two charges 2C and 6C are separated by a finite distance. If charge of -4C is added to each of them. The initial force of 12×10³ N will change into __________.
Doubt by Diya
Solution : Coming Soon.
Case I
q1=2C
q2 = 6C
F = 12×10³ N
F = kq1q2/r²
12×10³ = 12k/r² — (1)
Case II
q1'=2C+(-4C) = -2C
q2'=6C+(-4C) = 2C
F'=k|q1'||q2'|/r²
F'=4k/r² — (2)
Dividing (2) by (1)
F'/12×10³ = 4/12
F' = (12/3)×10³ N
F' = 4×10³ N
Hence, required answer is F' = 4×10³ N.
