Aluminum rod#1 has a length l and a diameter d. aluminum rod#2 has a length 2l and a diameter 2d. if rod#1 is under tension t and rod#2 is under tension 2t, how do the changes in length of the two rods compare?
a) rod #2 has quadruple the change in length that rod #1 has.
b) rod #2 has double the change in length that rod #1 has.
c) rod #1 has double the change in length that rod #2 has.
d) they are the same.
e) rod #1 has quadruple the change in length that rod #2 has.

D

Explanation:

For Rod 1

length,diameter and Tension is L, d and T

for Rod 2 length,diameter and Tension is 2L, 2d and 2T

Change in Length is given by

where P=load

L=length

A=area of cross-section

E=young's Modulus

since both are aluminium rod therefore E is common

Thus extension in both the rods are same

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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