NDA 2022 Physics question
Two resistors and arranged in parallel combination in an electrical closed circuit are made of the same material and of same thickness. If the length of is twice the length of , then the total resistance satisfies
Answer: (A)
Solution
For wires of the same material and thickness, resistance is proportional to length, so . In parallel, \dfrac{R_1R_2}{R_1 + R_2}$
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