plants which does not have a stomata
the length of wire is doubled how is its resistivity affected explain
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The Resistivity of the wire will not changewith the change in length. Resistivity is a property of the wire, it doesn't depend upon it’s length or cross-sectional area.
However, If you are asking about Resistance, it will increase to 4 times it’s initial value.
Resistance,R = ρl/A
Where,
ρ=Resistivity of the wirel=lenght of wireA= cross section of the wire
So, now if you increase the length of wire by 2 times it’s cross-sectional area will decrease by 2 times, because the volume of the wire has to remain constant.
Let, the initial and final radius of the wire be r1,&r2 respectively.
Since the initial and final volume are equal, so
2π(r1^2)l = 2π(r2^2)(2l)
So, r2=r1/√2
So, the cross-sectional area becomes 1/2 times the initial value.
Putting the values in the formula for resistance, we get the new resistance 4 times greater than the initial vakuev of resistance.
plants do not have stomata is hydrophytes ( eg. water ferns )
However, If you are asking about Resistance, it will increase to 4 times it’s initial value.
Resistance,R = ρl/A
Where,
ρ=Resistivity of the wirel=lenght of wireA= cross section of the wire
So, now if you increase the length of wire by 2 times it’s cross-sectional area will decrease by 2 times, because the volume of the wire has to remain constant.
Let, the initial and final radius of the wire be r1,&r2 respectively.
Since the initial and final volume are equal, so
2π(r1^2)l = 2π(r2^2)(2l)
So, r2=r1/√2
So, the cross-sectional area becomes 1/2 times the initial value.
Putting the values in the formula for resistance, we get the new resistance 4 times greater than the initial vakuev of resistance.
plants do not have stomata is hydrophytes ( eg. water ferns )
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