Question

a wire that has resistance are is cut into equal pieces. The two parts are join inparllel what is the resistance of the combination.

Answer 1

may be it is. R^eq=1/r1+1/r2

Answer 2

Resistance of a piece opf wire is directly prop. to its length as the wire is cut in 2 equal parts

R of each part = R/2

in // combination equivalent resistance ; R = 1/R1 + 1/R2

SO , HERE R = 1/ R/2 +1/ R/2

= 2/R + 2/R

= 4/R

THUS the resistance of the combination is 1/4th of the original resistance.