Home
Class 11
PHYSICS
Three metal rods of same length and same...

Three metal rods of same length and same cross - sectional area are connected in parallel. If their conductivities area 70, 110, 180 `Wm^(-1) K^(-1)` respectively, the effective conductivity (in `Wm^(-1) K^(-1))` of the combination is

A

90

B

260

C

130

D

360

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF BULK MATTER

    PRADEEP|Exercise Fill in the Blanks E|10 Videos

  • PROPERTIES OF BULK MATTER

    PRADEEP|Exercise Problmes for Practice|198 Videos

  • PROPERTIES OF BULK MATTER

    PRADEEP|Exercise Fill in the Blanks D|10 Videos

  • PHYSICAL WORLD AND MEASUREMENT

    PRADEEP|Exercise Competiton Focus Jee Medical Entrance|18 Videos

  • RAY OPTICS

    PRADEEP|Exercise Problem For Practice(a)|25 Videos

Similar Questions

Explore conceptually related problems

The metal rods of same length and same area of cross-section are connected in series. If their condcutivites are 120 Wm^(-1) and 240 Wm^(-1) K^(-1) the effective conductivity of the combination is

Two metal wires of identical dimesnios are connected in series. If sigma_(1) and sigma_(2) are the conducties of the metal wires respectively, the effective conductivity of the combination is

Two identical metal wires of thermal conductivities K_(1) and K_(2) respectively are connected in series. The effective thermal conductivity of the combination is :

Three metal rods of same lenghs and same area of cross sections having conductivities 1,2,3, units are connected in series Then their effective conductivity will be .

Two conducting rods A and B of same length and cross-sectional area are connected (i) In series (ii) In parallel as shown. In both combination a temperature difference of 100° C is maintained. If thermal conductivity of A is 3 K and that of B is K then the ratio of heat current flowing in parallel combination to that flowing in series combination is

Three rods each of same length and cross - section are joined in series. The thermal conductivity of the materials are K, 2K and 3K respectively. If one end is kept at 200^@C and the other at 100^@C . What would be the temperature of the junctions in the steady state? Assume that no heat is lost due to radiation from the sides of the rods.

A metal rod of area of cross section A has length L and coefficient of thermal conductivity K the thermal resistance of the rod is .

Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K_(1) and K_(2) and cross sectional areas A_(1) and A_(2) respectively. If the rate of heat conduction in 1 is four times that in 2, then

" A metal rod of area of cross section A has length L and coefficient of thermal conductivity K The thermal resistance of the rod is "

Knowledge Check

  • The metal rods of same length and same area of cross-section are connected in series. If their condcutivites are 120 Wm^(-1) and 240 Wm^(-1) K^(-1) the effective conductivity of the combination is

    A
    `150 Wm^(-1)" " K^(-1)`
    B
    `160 Wm^(-1)" " K^(-1)`
    C
    `180 Wm^(-1)" " K^(-1)`
    D
    `80 Wm^(-1)" " K^(-1)`

  • Two metal wires of identical dimensions are connected in series. If sigma_(1) and sigma_(2) are the conductivities of the metal wires respectively, the effective conductivity of the combination

    A
    `(sigma_(1)sigma_(2))/(sigma_(1) +sigma_(2))`
    B
    `(2sigma_(1)sigma_(2))/(sigma_(1) +sigma_(2))`
    C
    `(sigma_(1)+sigma_(2))/(2sigma_(1)sigma_(2))`
    D
    `(sigma_(1)+sigma_(2))/(sigma_(1)sigma_(2))`

  • Two metal wires of identical dimesnios are connected in series. If sigma_(1) and sigma_(2) are the conducties of the metal wires respectively, the effective conductivity of the combination is

    A
    `(sigma_(1) sigma_(2))/(sigma_(1) + sigma_(2))`
    B
    `(2 sigma_(1) sigma_(2))/(sigma_(1) + sigma_(2))`
    C
    `(sigma_(1) + sigma_(2))/(2 sigma_(1) + sigma_(2))`
    D
    `(sigma_(1) + sigma_(2))/(sigma_(1) + sigma_(2))`