Question

A $200\Omega$ resistor has a certain colour code. If one replaces the red colour by green in the code, the new resistance will be

• A. $400\Omega$
• B. $500\Omega$
• C. $100\Omega$
• D. $300\Omega$

Answer 1

The correct option is B $500\Omega$

Given, resistance
$R=200\Omega =20\times {10}^1\Omega$
So, Colour scheme will be red, black and brown.
Significant figure of red band is 2 and for green is 5 . When red (2) is replaced with green (5), new resistance will be,
$R^{\prime }=50\times {10}^1\Omega =500\Omega$
Hence , option $\left(D\right)$ is correct.