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Find the values of ointvecB.vec(dl) for ...

Find the values of `ointvecB.vec(dl)` for the loops `L_1, L_2 and L_3` in Fig. (The sense of `vec(dl)` is mentioned in the figure)

Text Solution

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For `L_1, ointvecB.dl=mu_0(I_1-I_2)`. Here `I_1` is taken postive because
magnetic lines of forces produced by `I_1` is anti-lockwise as seen
from top. `I_2` produces lines of `vecB` in clockwise sense as seen from
top. The sense of `vecdl` is anticlockwise as seen form top.
For `L_2: ointvecB.vecdl=mu_0(I_1-I_2+I_4)`
For `L_3: oint vecB.vecdl=0`
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