KCET · Physics · Current Electricity
The resistance of a carbon resistor is \(4.7 \mathrm{k} \Omega\) \(\pm 5 \%\). The colour of the third band is
- A gold
- B red
- C violet
- D orange
Answer & Solution
Correct Answer
(B) red
Step-by-step Solution
Detailed explanation
Given, resistance of carbon resistor
\(R=4.7 \mathrm{k} \Omega \pm 5 \%=47 \times 10^2 \Omega \pm 5 \%\)
The colour of four bands will be \(4 \rightarrow\) yellow
\(\begin{aligned} & 7 \rightarrow \text { Violet } \\ & 2 \rightarrow \text { Red } \\ & \pm 5 \% \rightarrow \text { Gold }\end{aligned}\)
Thus, colour of third band is red.
\(R=4.7 \mathrm{k} \Omega \pm 5 \%=47 \times 10^2 \Omega \pm 5 \%\)
The colour of four bands will be \(4 \rightarrow\) yellow
\(\begin{aligned} & 7 \rightarrow \text { Violet } \\ & 2 \rightarrow \text { Red } \\ & \pm 5 \% \rightarrow \text { Gold }\end{aligned}\)
Thus, colour of third band is red.
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