Four wires of the same diameter are connected- in turn- between two points maintained at a constant potential difference- Their resistivity-s and lengths are- - and L wire 1- 1-2 - and 1-2L wire 2- 0-9- and 0-9L wire 3 and - and 1-5L wire 4- Rank the wires according to the rates at which energy is dissipated as heat- greatest first-

Four wires of same materials have the following dimensions:
Wire $1$ : Length $l$ , Cross section area $A$
Wire $2$ : Length $l$ , Cross section area $2 A$
Wire $3$ : Length $0.5 l$ , Cross section area $1.5 A$
Wire $4$ : Length $2 l$ , Cross section area $0.5 A$

Which wire has the highest resistance?

Q. Two wires of same mass having ratio of lengths

1 : 2

, density

1 : 3

and resistivity

2 : 1

. These are connected one by one to the same voltage supply. The rate of heat dissipation in the first wire is found to be

10 W

. Find the rate of heat dissipation in the second wire.

Q. Equal currents are flowing in four infinitely long wires. Distance between any two adjacent wires is same, then

\begin{matrix} Column I & Column II 1) force on wire 1 & p) inwards 2) force on wire 2 & q) leftwards 3) force on wire 3 & r) rightwards 4) force on wire 4 & s) zero \end{matrix}

Q. Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has a length 2l and diameter r/2. If the two wires are stretched by the same force, the elongation in A divided by the elongation in B is
(a) 1/8
(b) 1/4
(c) 4
(d) 8

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