Question

A wire of 3 ohm resistance and have 15 cm length that stretch to 45 cm. find cross section area and new resistance and resistivity

Answer 1

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Resistance R = 3ohm

length L=15cm=0.15m

R=resistivity L/A

3=rho 0.15/A

rho /A=3/0.15………1

new length L1=45cm=0.45m

The area is same then

New resistance R1 =rho L1/A

R1=3/0.15 x L1

R1=3x0.45/0.15

R1=9 Ohm

Hope It Will Help.❤

Answer 2

Answer:

9 ohms

Step-by-step explanation:

resistance R=3ohm

length L=15cm=0.15m

R=resistivity L/A

3=rho 0.15/A

rho /A=3/0.15………1

new length L1=45cm=0.45m

The area is same then

New resistance R1 =rho L1/A

R1=3/0.15 x L1

R1=3x0.45/0.15

R1=9 Ohm