1.

A 4ohm resistance wire id doubled in it,calculate the new resistance?​

Answer»

Answer:

When the wire is doubled the LENGTH will be halved and area will be DOUBLE or TWICE 

R = PL/A 

R1 = P(L/2) / 2A Where R1 is the new resistance 

So R1/R = {P(L/2) / 2A} / {PL/A} 

When we SOLVE this we get  R1/R = ¼ 

=> R1 = R/4 = 4/4 = 1 OHM



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