Question

If diameter of a wire of 1 ohm is tripled then its resistence will become

Answer 1

Answer:

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Explanation:

Answer: As the resistance of a wire is inversely proportional to the square of the diameter of a conducting wire if its diameter is tripled its resistance becomes 9th part of the previous resistance.

Answer 2

Answer:

Explanation:

resistance(R) is directly proportional(=) to length(l) ,

inversely proportional to area(A)

I) if length length is tripled I.e 3l

for initial R = l then what is the resistance(x) if length is 3l

then x= 3R

therefore resistance become triple time of initial

ll)R= 1/A = 1/(πr²)

2r =d ( diameter ) for initial

if diameter becomes triple

x= 1/(π(6r/2)²)

x = 1/(π/9r²)

x= 1/9(R)

I.e the resistance will decrease 9 times of initial .

lll) R = resistivity (l/A)

if resistivity becomes thrice then resistance will be 3 times of initial

hope its helps u