A metal wire having resitance R ,stretched in such a way that its radius become half. New value of resistance is
16R
R/16
4R
R/4
As we learnt
Ratio of resistances -
If radius is given
- wherein
Since R is proportional to 1/r4(r=radius of the wire)
As r is halved , the resistance become 16 times.
Option 1)
16R
Option 2)
R/16
Option 3)
4R
Option 4)
R/4
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