The following four wires are made of the same material and are at the same temperature. Which one of them has the highest electrical resistance?
a)
Length=50 cm, diameter=0.5 mm
b)
Length=100 cm, diameter=1 mm
c)
Length=200 cm, diameter=2 mm
d)
Length=300 cm, diameter=3 mm
The following four wires are made of the same material and are at the same temperature. Which one of them has the highest electrical resistance?
a)
Length=50 cm, diameter=0.5 mm
b)
Length=100 cm, diameter=1 mm
c)
Length=200 cm, diameter=2 mm
d)
Length=300 cm, diameter=3 mm
Question ID - 151406 | SaraNextGen Top Answer
The following four wires are made of the same material and are at the same temperature. Which one of them has the highest electrical resistance?
a)
Length=50 cm, diameter=0.5 mm
b)
Length=100 cm, diameter=1 mm
c)
Length=200 cm, diameter=2 mm
d)
Length=300 cm, diameter=3 mm
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The following four wires are made of the same material and are at the same temperature. Which one of them has the highest electrical resistance? |
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a) |
Length=50 cm, diameter=0.5 mm |
b) |
Length=100 cm, diameter=1 mm |
|
c) |
Length=200 cm, diameter=2 mm |
d) |
Length=300 cm, diameter=3 mm |
1 Answer
127 votes
Answer Key / Explanation : (a) -
|
(a) Resistance of a wire As
|
where 
is diameter of wire
, hence it is clear that resistance will be maximum if 
is maximum. On calculation we find
maximum when, 
cm and 
mm127 votes
Answer Link
127