What is the resistance of a 20.0-meter-long
tungsten rod with a cross-sectional area of
1.00 × 10^−4 meter2 at 20°c?
(1) 2.80 × 10^−5 ω (3) 89.3 ω
(2) 1.12 × 10^−2 ω (4) 112 ω

Option (2)

Explanation:

The resistance of a conductor is directly proportional to the length of the conductor and inversely proportional to the area of the conductor. The formula for the resistance is given by

Where, ρ is the resistivity of tungsten, l be the length of tungsten and a be the area of cross section.

The value of resistivity for tungsten is 5.6 x 10^-8 ohm metre.

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c.arachnids

  scorpions are animals in the order scorpiones, under the class arachnida, which makes them a distant cousin of spiders

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