Physics-
General
Easy

Question

Two long parallel wires are at a distance 2 d apart. They carry steady equal current flowing out of the plane of the paper as shown. The variation of the magnetic field along the line X X ´is given by

  1.  

The correct answer is:


    The magnetic field in between because of each will be in opposite direction
    B subscript i n blank b e t w e e n end subscript equals fraction numerator mu subscript 0 end subscript i over denominator 2 pi x end fraction stack J with hat on top minus fraction numerator mu subscript 0 end subscript i over denominator 2 pi blank left parenthesis 2 d minus x right parenthesis end fraction blank left parenthesis negative stack j with hat on top right parenthesis
    equals fraction numerator mu subscript 0 end subscript i over denominator 2 pi end fraction open square brackets fraction numerator 1 over denominator x end fraction minus fraction numerator 1 over denominator 2 d minus x end fraction close square brackets blank left parenthesis stack j with hat on top right parenthesis
    At x equals d comma blank B subscript i n blank b e t w e e n end subscript equals 0
    For x less than d comma blank B subscript i n blank b e t w e e n blank end subscript equals left parenthesis stack j with hat on top right parenthesis
    For x greater than d comma blank B subscript i n blank b e t w e e n end subscript equals left parenthesis negative stack j with hat on top right parenthesis
    Towards x comma net magnetic field will add up and direction will be open parentheses negative stack j with hat on top close parentheses.
    Towards x to the power of ´ end exponent comma net magnetic field will add up and direction will be open parentheses negative stack j with hat on top close parentheses.

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