Question

the resistance of a wire is 20 ohms.it is so stretched that the length becomes three times then the new resistance of the wire will be​

Answer 1

Answer:

The new resistance will be 20/3 i.e. 6.66Ω

Explanation:

We know that R=ρl/a ,so the 2nd R will be 3R and then is we equalise the first R and the second R ,then it forms an equation 3R= 20 which comes R=20/3.

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