Question

In this section of a circuit, resistors R1, R2, and R3 combine for an equivalent resistance of 4.0 ohm. What is R2? Let R1 = 6.0 ohm and R3= 2.0 ohm.

Answer 1

R2=10ohm

Step-by-step explanation:

In this combination

R2 and R3 are in series combination where R1 is in parallel combination with them hence

R2+R3=R`

And

1/R`+1/R1=1/Req

1/R`=1/Req-1/R1

1/R`=1/4-1/6

=1/12

R`=12ohm

Also

R2+R3=R`

R2=R`-R3

R2=12-2

R2=10ohm