A wire of 3 ohm resistance and 10 cm length is stretched to 30 cm length. Assuming it has uniform cross section. what will be its new resistance?
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case 1
specific resistance =R*a/l=3a/10
case 2
specific resistance is same 3a/10
and new resistance
=specific resistance *length /area
new area will be a/3
as length is made 3times
=3a/10 *30* 3/a
=27ohm
specific resistance =R*a/l=3a/10
case 2
specific resistance is same 3a/10
and new resistance
=specific resistance *length /area
new area will be a/3
as length is made 3times
=3a/10 *30* 3/a
=27ohm
Anonymous:
is it correct
? I hope it is not wrong and helps you
say if it is correct or not
yeah its correct, thanks
oh Thnx and Wlcm too
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