Question

resistance of a conductor wire of length one metre is 5 ohm ,calculate the resistance of the wire made by same material is length is 4 times and area of cross section is five times that of wire x​

Answer 1

Answer:

GIVEN::

L2 = 4L1 and A2 = 5A1

WE know, R = roh × L/A

So,

R1 = roh ×L1/A1 . So roh = 5×A1/L1

R2 = roh × L2/A2 ={ 5×A1/L1 } × 4(L1) / 5(A1)

on solving

R2 = 4 ohm