Home
Class 12
PHYSICS
Two copper wires of length 1m and 9m hav...

Two copper wires of length 1m and 9m have equal resistances. Then their diameters are in the ratio:

A

`3:1`

B

`9:1`

C

`1:9`

D

`1:3`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

A copper wire of length 2.2 m and a steel wire of length 1.6m, both of diameter 3mm are connected end to end. When stretched by a load, the net elongation is found to be 0.70 mm. Obtain the load applied. (Y_(s)=2.0xx10^(11)Nm^(-2)) (Y_(c)=1.1xx10^(11)Nm^(-2))

Two rings have their moemnts of inertia in the ratio of 4:1 and their diameters are in the ratio of 4:1. Find the ratio of their masses.

Two steel wires of lengths 1 m and 2 m have diameters 1 mm and 2mm respectively . If they are stretched by force of 40 N and 80 N respectively, find the ratio of their elongations.

A wire of length 1 m and radius 0.1mm has a resistance of 100(Omega) .Find the resistivity of the material .

An inductor coil of inductance 17 mH is constructed from a copper wire of length 100 m and cross - sectional are 1mm^2 . Calculate the time constant of the circuit if this inductor is joined across an ideal battery. The resistivity of copper = 1.7 X 10^(-8) Omega m.

A resistance of a metal wire of length AB is 2Omega . Another wire of length PQ of te same metal with twice the diameter of the wire AB is found to hage the same resistance of 2Omega . What is the length of PQ?