Question

The resistance of a conducting wire X of length 1 m is 5 12. Calculate the
resistance of the wire made by the same material whose length is 4 times
and area of cross-section is 5 times that of wire X. (At same temperature).​

Answer 1

Hyy Dude

Answer:

Initial resistance for wire X = 5 ohm = p(L/A)

Now, length of new wire = 4 times

Area of new wire = 5 times

Hence , new resistance be R"

R" = p(L"/A")

=> R" = p(4L/5A)

=> R" = p(L/A) × 4/5

=> R" = 5 × 4/5

=> R" = 4 ohms.

Resistance = 4 ohm

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