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
Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
The effective resistance between points P and Q of the electrical circuit shown in the figure is...There are eight resistances of R ohm each. Two-two resistances are connected in parallel to form couples and these coupl...The current through the ammeter shown in figure is 1 A. If each of the 4Ω resistor is replaced by 2Ω resistor,...Figure shows a thick copper rod X and a thin copper wire Y, joined in series. They carry a current which is sufficient t...The specific resistance of a metal wire is 64 × 10−6 Ω × cm., the length is 198 cm and the resistan...