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9 Questions around this concept.
If a wire is stretched to make it 0.1% longer, its resistance will
A wire of resistance 4 is stretched to twice its original length. The resistance of a stretched wire would be:
The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter, the change in the resistance of the wire will be (in %)
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What length of wire (Specific resistance is needed to make a resistance of
?
A wire of resistance is used to wind a coil of radius
. The wire has a diameter of
and the specific resistance of its
arterial is
. The number of turn in the coil is -
Stretching of wire
If a conducting wire stretches its length increases area of cross-section decreases but volume remains constant
Suppose for a conducting wire before stretching
it's length
and resistance
After stretching length
and resistance
But Volume is constant So
Now
- If a wire of resistance R and length I is stretched to length nl , then new resistance of wire is
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