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11 March, 22:19

Two long straight wires enter a room through a window. One carries a current of 2.9A into the room, while the other carries a current of 4.4 out of the room. Calculate the magnitude (in T. m) of the path integral of B. ds around the window frame.

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  1. 12 March, 01:28
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    Answer and Explanation:

    curents i = 2.9 A

    i ' = 4.4 A

    the magnitude (in T. m) of the path integral of B. dl around the window frame = μo * current enclosed

    = μo * (i ' - i)

    Since from Ampere's law

    where μ o = permeability of free space = 4π * 10 ^-7 H / m

    plug the values we get the magnitude (in T. m) of the path integral of B. dl = (4π*10^-7) (2.9+4.4)

    = 1.884 * 10^-6 Tm
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