Question

Two resistance $R_1=100\pm 3\omega$ and $R_2=200\pm 4\omega$ are connected in series. Find the equivalent resistance of the series combination.

• A. $300\pm 8$ omega
• B. $300\pm 7$ omega
• C. $600\pm 7$ omega
• D. $300\pm 6$ omega

Answer 1

The correct option is B $300\pm 7$ omega

$R_1=100\pm 3w$

$R_2=200\pm \mu w$

Equivalent resistance is series $R=R_1+R_2=300$

Error $\Delta R={\Delta R}_1+\Delta R_2$

$=4+3$

$=7$

Equivalent resistance with error $=300\pm 7\omega$