\(t =1\,sec\)
\(\therefore V =\frac{0.05}{1}=0.05\,m / s\)
\(i =\frac{40 \times 0.05 \times 0.05}{10}=0.01\,A\)
\(F = B { i } l=40 \times 0.01 \times 0.05\)
\(F =0.02\,N\)
\(\therefore \quad W =0.02 \times l=0.02 \times .05\)
\(\therefore \quad W =1 \times 10^{-3}\,J\)