TS EAMCET · Physics · Current Electricity
A metal wire of length and radius has a resistance . If a wire of the same metal of length and radius is taken, then what will be its resistance?
- A
- B
- C
- D
Answer & Solution
Correct Answer
(A)
Step-by-step Solution
Detailed explanation
As metal used in both the cases is same, therefore, ρ will remain same, Now, for first case, R1=ρL1A1⇒R=ρLπr2 ...Eq1 Similarly, for second case we can write, R2=ρL2A2⇒R2=ρ2Lπ3r2 ...Eq2 Dividing…
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