By using only two resistance coils-singly, in series, or in parallel one should be able to obtain resistances of 3, 4, 12 and 16 ohms . The separate resistances of the coil are

Options

A. 3 and 4
B. 4 and 12
C. 12 and 16
D. 16 and 3

Answer

B

Explanation

If we take `R_(1)=4Omega,R_(2)=12Omega,`then in seriesm resistance
`R_(S)=R_(1)+R_(2)=4+12=16Omega`
in paralle,, resistance, `R_(p)=(4xx12)/(4+12)=3Omega`
So,`R_(s)=4Omega
`R_(p)=12Omega`