A metallic wire of uniform area of cross section has a resistance R, resistivity ρ and power rating P at V volts. The wire is uniformly stretched to reduce the radius to half the original radius. The values of resistance, resistivity and power rating at V volts are now denoted by R', ρ' and P' respectively. The corresponding values are correctly related as ________________.
Fill in the blank with the correct answer from the options given below
1
ρ' = 2ρ, R' = 2R, P' = 2P
2
ρ' = (1/2)ρ, R' = (1/2)R, P' = (1/2)P
3
ρ' = ρ, R' = 16R, P' = (1/16)P
4
ρ' = ρ, R' = (1/16)R, P' = 16P