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

Options

A. `500 Omega`
B. `400 Omega`
C. `300 Omega`
D. `100 Omega`

Explanation

To solve the problem, we need to first understand the color code for resistors and how changing the color affects the resistance value.

### Step-by-Step Solution:

1. **Identify the Original Resistance Value**:
The given resistance is 200 ohms. In the standard format for color codes, this can be expressed as:
\[ 200 \, \Omega = 20 \times 10^1 \]
Here, '20' indicates the first two digits of the resistance, and '1' indicates the power of ten.

2. **Determine the Color Code for 200 Ohms**:
The color code for the resistance can be broken down as follows:
- The first digit '2' corresponds to the color Red.
- The second digit '0' corresponds to the color Black.
- The multiplier '10^1' corresponds to the color Brown.

Therefore, the original color code for 200 ohms is:
- Red (2), Black (0), Brown (1).

3. **Change the Color Code**:
According to the problem, we are replacing the Red color with Green. The new color code will be:
- Green (5), Black (0), Brown (1).

4. **Calculate the New Resistance Value**:
Now, we need to find the resistance value represented by the new color code:
- Green represents '5'.
- Black represents '0'.
- Brown represents the multiplier '10^1'.

So, the new resistance can be calculated as:
\[ \text{New Resistance} = 50 \times 10^1 = 500 \, \Omega \]

5. **Conclusion**:
Therefore, when the red color is replaced by green in the color code, the new resistance will be **500 ohms**.

### Final Answer:
The new resistance will be **500 ohms**.