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To break a wire of one meter length, min...

To break a wire of one meter length, minimum 40 kg wt. is required. Then the wire of the same material of double radius and 6 m length will require breaking weight

A

40 kg-wt

B

80 kg -wt

C

160 kg-wt

D

320 kg-wt

Text Solution

Verified by Experts

The correct Answer is:
C
(c) Breaking force=Breaking stress `xx` area of cross-section of wire
`therefore` Breaking force `prop r^(2)`
If radius becomes doubled, then breaking force becomes 4 times i.e. `40xx4=160 kg-wt`
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