Question

A wire of resistance 12 ohms per meter is bent to form a
complete circle of radius 10 cm. The resistance between
its two diametrically opposite points, A and B as shown
in the figure is
(a) 322
(b) 6π Ω
A
(c) 62
(d) 0.61 22
B​

Answer 1

Answer:

0.6π ohm

Explanation:

length of semicircle = πr

resistance per unit length = 12ohm/metre = 0.12ohm/cm

resistance of πr length will be = 0.12*πr ohm

now it is connected in parallel with another half of the same resistance..

Req. = (0.12πr)(0.12πr)/ 2(0.12πr)

Req. = 0.06πr

Req. = (0.06)(10)π

Req. = 0.6π ohm

hope uu git your answer