physics

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a piece of wire has a resistance of R , it is cut into three pieces of equal length,and the pieces are twisted together parallel to each other. what is the resistance of the resulting wire in terms of R

  • physics -

    nine

  • physics -

    R/3

  • physics -

    As we know that
    R is cutted into 3 equal parts and they are parallel to each other
    But we have to remember that we have resultant in terms of R
    Thus
    Rn=1/R1+1/R2+1/R3
    As R1=R2=R3=R
    Thus 1/R+1/R+1/R=1/Rn
    1/Rn=3/R
    Rn=R/3

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