NEET Physics Current Electricity Questions Solved

PMT - 2000

What length of the wire of specific resistance 48×108Ω  mis needed to make a resistance of 4.2 Ω (diameter of wire = 0.4 mm

(1) 4.1 m

(2) 3.1 m

(3) 2.1 m

(4) 1.1 m

(4) l=Rπr2ρ

=4.2×3.14×(0.2×103)248×108=1.1m 

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