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A given piece of wire of length  and radius  is having a resistance  This wire is stretched uniformly to a wire of radius . What is the new resistance?

a)

b)

c)

d)


Question ID - 150498 | Toppr Answer

A given piece of wire of length  and radius  is having a resistance  This wire is stretched uniformly to a wire of radius . What is the new resistance?

a)

b)

c)

d)

1 Answer - 5876 Votes

3537

Answer Key : (c) -

(c)

Resistance of wire given by

Also, volume (V)=Length ×Area

Where,                 (r is radius)

When the wire is stretched its volume (V) remains constant.

Hence,

When radius is halved

Hence, new resistance increases to sixteen times its original value.



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