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Physics-

General

Easy

Question

Three rods of material x and three rods of material y are connected as shown in figure all the rods are of identical length and cross section If the end A is maintained at 60 $degree$ C and the junction E at 10 $degree$ C, find effective Thermal Resistance Given length of each rod=l, area of cross-section=A, conductivity of x=K and conductivity of y=2K

$\frac{4 l}{3 K A}$
$\frac{7 l}{6 K A}$
$\frac{4 K A}{3 l}$
$\frac{7 K A}{3 l}$

The correct answer is: $fraction numerator 7 l over denominator 6 K A end fraction$

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One end of a copper rod of uniform cross section and of length 1.5m is kept in contact with ice and the other end with water at 100 $degree$ C At what point along its length should a temperature of 200 $degree$ C be maintained so that in steady sate, the mass of ice melting be equal to that of the steam produced in same interval of time? Assume that the whole system is insulated from surroundings $open parentheses L subscript text ice end text end subscript equals 80 c a l divided by g m close text end text$ and $text end text open L subscript text steam end text end subscript equals 540 c a l divided by g m close parentheses$

physics-General

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