Q. The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is
A) $21 \times 10^{3} \pm 10\%$
B) $23 \times 10^{1} \pm 10\%$
C) $21 \times 10^{3} \pm 5\%$
D) $12 \times 10^{3} \pm 5\%$
Explanation
(a) Red, brown, orange, silver red and brown represents the first two significant figures
[table] Significant figures | Multiplier | Tolerance ; Red Brown | Orange | Silver ; 2 1 | $10^{3}$ | $\pm 10\%$ [/table]
$\therefore R = 21 \times 10^{3} \pm 10\%$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.