Two cylindrical resistors R1​ and R2​ made from the same material are connected in parallel in a circuit. Both resistors are at the same temperature when the circuit is operational. Resistor R1 has length ℓ and diameter dd. Resistor R2 has length 7ℓ  and has a diameter  d/2. Determine by what factor is the resistance R2​ greater than R1.

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