Question

the resistance of a conducting wire x of length one metre is 5 ohm calculate the resistance of the wire made by the same material whose length is 4 times our area of cross sections is five times that of wire x ​

Answer 1

Answer: Let the resistivity of wire x be p and area of cross section be A

L=1m   R=5 ohm

so,

5= p*1/A -----------(1)

If length of wire is increased by 4 times and area of cross section of wire be increased by 5 times. So new length be 4m and Area of c.s. is 5A so new resistance be O

O=p*4/5

= 5*4/5

= 4 ohm ans

Answer 2

Answer:

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