Question

30. A uniform wire of resistance 36 12 is bent in the form of a circle. The effective resistar
across the points A and B is
​

Answer 1

it is clear that two wires of resistance 18ohm are joined in parallel, then effective resistance across the points A and B will be , Req = 18 × 18/(18 + 18) = 9 ohm. hence, effective resistance across the points A and B will be 9ohm

Answer 2

Answer:

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

Explanation:

⋇⋆✦⋆⋇　Hope this help you. ⋇⋆✦⋆⋇