Current Electricity and Electrical InstrumentHard
Question
Four wire of the same diameter are connected in turn between two points, maintained at a constant difference. Their resistiveties are; ρ and L(wire 1)., 1.2ρ and 1.2L (wire 2),0.9ρ and 0.9L(wire 3) and 1.5L(wire 4). Rank the wires according to the rates at which energy is dissipated as heat, greatest first
Options
A.4 > 3 > 1 > 2
B.4 > 2 > 1 > 3
C.1 > 2 > 3 > 4
D.3 > 1 > 2 > 4
Solution
∴ R3 < R1 < R2 < R2
For constant potential, P ∝
, ∴ P3 < P1 < P2 < P4
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