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Physics Question 11 – NEET-UG 2023

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Resistance of a carbon resistor determined from colour codes is (22000±5%)Ω. The colour of third band must be :

Carbon resistors use a color banding system to indicate their resistance value and tolerance.

Step 1: Understand the Carbon Resistor Color Code✦ Active

The resistance value of a carbon resistor is represented by a series of colored bands. The first two bands represent the first two significant digits, the third band represents the decimal multiplier, and the fourth band (if present) indicates the tolerance.

💡 Teacher's Secret Hint

Remember the mnemonic "BB ROY Great Britain Very Good Wife" for the order of colors and their corresponding digits (Black=0, Brown=1, Red=2, Orange=3, Yellow=4, Green=5, Blue=6, Violet=7, Grey=8, White=9).

Step 2: Deconstruct the Given Resistance Value○ Expand

The given resistance is R=(22000±5%)Ω. This can be written as R=22×103Ω±5%. From this, we can identify:

- The first significant digit is 2.

- The second significant digit is 2.

- The multiplier is 103.

- The tolerance is ±5%.

💡 Teacher's Secret Hint

Pay close attention to the number of zeros to correctly identify the power of 10 for the multiplier band.

Step 3: Identify the Color of the Third Band○ Expand

Using the standard carbon resistor color code:

- The first digit '2' corresponds to Red.

- The second digit '2' corresponds to Red.

- The multiplier '103' corresponds to Orange.

- The tolerance '±5%' corresponds to Gold.

Therefore, the color of the third band, which represents the multiplier 103, is Orange.

22000Ω=2 (Red)2 (Red)×103 (Orange)
💡 Teacher's Secret Hint

Ensure you correctly map the multiplier value to its corresponding color from the standard color code chart.

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