A short conductor of length `5*0cm` is placed parallel to a long conductor of length `1*5cm` near its centre. The conductors carry currents `4*0A` and `3*0A` respectively in the same direction. What is the total force experienced by the long conductor, when they are `3*0cm` apart?

Answer

`4xx10^-6N`; attractive

Explanation

Force on long conductor is equal and opposite to the force on small conductor `=(mu_0)/(4pi)(2I_1I_2l)/(r)`
Here, `I_1=4*0A`, `I_2=3*0A`,
`r=3*0xx10^-2m`, `l=5*0xx10^-2m`.