Wires 1 and 2 carrying currents i1 and i...

Wires 1 and 2 carrying currents `i_1 and i_2` respectively are inclined at an angle `theta` to each other. What is the force on a small element `dl` of wire 2 at a distance of r from wire 1 (as shown in the figure) due to the magnetic field of wire 1 ?

`(mu_0)/(2pi r) i_1i_2 dl tan theta`

`(mu_0)/(2pi r) i_1i_2 dl sin theta`

`(mu_0)/(2pi r) i_1i_2 dl cos theta`

`(mu_0)/(4pi r) i_1i_2 dl sin theta`

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