Q

A wire of a given material has length l and cross-sectional area A , and its resistance is 9 Ω. Another wire of the same material has length l/3 and cross-sectional area 3A. What will be the resistance of the second wire?

RRB JE 20/02/2026 / 4:30 PM - 6:00 PM 2026
✓ Answer: D 1 Ω
Kinetic energy is 1/2 mv². For equal masses, doubling the speed makes kinetic energy four times as large. Thus kinetic energy depends strongly on speed.
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