A conductor `ab` of arbitrary shape carries current I flowing from `b` to `a`. The length vector `ab` is oriented from `a` to `b`. The force `F` experienced by this conductor in as uniform magnetic field B is

Options

A. `vecF=-I(vec(ab)xxvecB)`
B. `vecF=I(vecBxxvec(ab))`
C. `vecF=I(vecbaxxvecB)`
D. All of these

Answer

D

Explanation

`vecF=I(vec1xxvecB)=I(vec(ba)xxvecB)`. We can see that all (A), (B) and (C) options are same.