Question

42. Wire A has a resistance of 16 ohm. Wire B has the same
dimensions as A but is made from a material which has
half the resistivity of wire A. What is the resistance of
wire B?
(a) 40 ohm
(b) 89 ohm
(c) 320 ohm
(d) 642 ohm​

Answer 1

Answer:

circular wire made of 'B' has twice the diameter of a wire made of 'A'. Then for the two wires to have the same resistance, the ratio lA/lB of their ... and please follow me