Question

A uniform wire of resistance 36ohm is bent in a circle ..what is effective resistance between A and B

Answer 1

Let L = length of the wire

Now resistance per unit length of the wire = 36/L 

360o subtends an wire length L

1o subtends a length of = L/360

30o subtends a  length of = L×(30/360 = L/12

Now resistance of the wire of length L/12 = (L/12)×(36/L) = 3 Ω

Answer 2

let L = length of the wire
now resistance per unit length of the wire =36/L
360• subtenends an wite lengthL
1•subtends a length of =L/360
30• subtends a length of =L*(36/360=L/12
now resistance of the wire of length L/12= (L/12)*(36/L)= 3ohm
this • (point) is degree and the star is *(multiply)
ok