1.

The position vectors of two point charges of 2 nC each are (2hati + 3hatj - hatk)m and (3hati + 5hatj + hatk)m respectively. Magnitude of the coulombian force acting between them is........

Answer»

`4 xx 10^(-3)` N
`4 xx 10^(-9)` N
`4 xx 10^(-6)` N
`10^(-3)` N

Solution :`vecr = vecr_(2) -vecr_(1) = (3hati + 5hatj + hatk) -2(hati - 3hatj -hatk)`
`=(hati + 2hatj + 2hatk)`
`therefore r = SQRT(1+4+4) = 3m`
`therefore F = (kq^(2))/r^(2) = (9 xx 10^(9) xx 4 xx 10^(-12))/9`
`=4 xx 10^(-3)` N


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