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Q.

A 5 m aluminium wire ( Y= 7 x 1010N/m2) of diameter 3 mm supports a 40 kg mass. In order to have the same elongation in a copper wire (Y = 12 x 1010 N/m2) of the same length under the same weight, the diameter should be (in mm): 

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a

1.75

b

2.0

c

2.3

d

5.0

answer is C.

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Detailed Solution

∆l=FLAY⇒D∞1Y

A1Y1=A2Y2
 

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