TS EAMCET · Physics · Current Electricity
The resistance of a wire is \(20 \Omega\). It is stretched, so that the length becomes three times, then the new resistance of the wire will be
- A \(200 \Omega\)
- B \(160 \Omega\)
- C \(120 \Omega\)
- D \(180 \Omega\)
Answer & Solution
Correct Answer
(D) \(180 \Omega\)
Step-by-step Solution
Detailed explanation
Initial resistance, \(R_l=20 \Omega \Rightarrow \frac{\rho l_l}{A_l}=20\)....(i) Now, \(\quad l_2=3 l_1\) \(\because\) Volume remains same.…
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