Home
Class 12
PHYSICS
Two resistors A and B have resistances R...

Two resistors A and B have resistances `R_(A) and R_(B)`respectively with `R_(A)lt(R_(B)`.the resistivities of their materials are `(rho_A) and (rho_B)`.

A

`rho_A gt rho_B`

B

`rho_A = rho_B`

C

`rho_A lt rho_B`

D

The information is not sufficient to find the relation between `rho_A and rho_B`.

Text Solution

Verified by Experts

The correct Answer is:
D
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DISHA PUBLICATION|Exercise EXERCISE-1 Concept Builder (Topicwise) Topic 3: Combination of Resistors|10 Videos
  • CURRENT ELECTRICITY

    DISHA PUBLICATION|Exercise EXERCISE-1 Concept Builder (Topicwise) Topic 4: Kirchhoff.s Laws and Cells|7 Videos
  • CURRENT ELECTRICITY

    DISHA PUBLICATION|Exercise EXERCISE-1 Concept Builder (Topicwise) Topic 1: Electric Current, Drift of Electrons and Ohm.s Low|13 Videos
  • CONCEPT BUILDER

    DISHA PUBLICATION|Exercise Exercise-2 Concept Applicator|27 Videos
  • DUAL NATURE OF RADIATION AND MATTER

    DISHA PUBLICATION|Exercise EXERCISE -2 : CONCEPT ALLPLICATOR|30 Videos

Similar Questions

Explore conceptually related problems

If resistors of resistance R_(1) and R_(2) are connected in parallel,then resultant resistance is "

Two wires of same material and same length have radii r_1 and r_2 respectively. Compare their resistances.

Knowledge Check

  • Two resistors of resistance R_(1) and R_(2) having R_(1) gt R_(2) are connected in parallel. For equivalent resistance R, the correct statement is

    A
    `R gt R_(1) +R_(2)`
    B
    `R_(1) lt R lt R_(2)`
    C
    `R_(2) lt R lt (R_(1)+R_(2))`
    D
    `R lt R_(1)`
  • In the, Ohm's law experiment to find resistance of unknown resistor R , following two arrangement ( a ) and ( b ) are possible. The resistance measured is given by R_(measured)=(V)/(i) V = voltage reading of voltmeter, i= current Reading of ammeter. But unfortunately the ammeters and voltmeter used are not ideal, but having resistance R_(A) and R_(V) respectively. You are given two resistor X and Y . Whose resistance is to be determined , using an ammeter of R_(A)=0.5Omega and a voltmeter of R_(V)=20 KOmega . It is known that X is in range of a few Ohm and Y is in range of several kilo ohm. Which of the circuit is preferable to measure X and Y -Resistor Circute

    A
    `x to (a)`, `y to (b)`
    B
    `x to (b)`, `y to (a)`
    C
    `x to (a)`, `y to (a)`
    D
    `x to (b)`, `y to (b)`
  • In the, Ohm's law experiment ot find resistance of unknown resistor R, the arrangement is as shown. The resistance measured is given by R_("measured")=(V)/(i)V= voltage reading of voltmeter. i=current reading of ammeter. The ammeters and the voltmeter used are not ideal, and have resistance R_(A) and R_(V) respectively. For arrangement shown, the meausred resistance is

    A
    `R+R_(V)`
    B
    `R+R_(A)`
    C
    `(RR_(v))/(R+R_(v))`
    D
    `(RR_(V))/(R+R_(V))+R_(A)`
  • Similar Questions

    Explore conceptually related problems

    The temperature coefficient of resistance for two material A and B are 0.0031^(@)C and 0.0068^(@)C^(-1) respectively .Two resistance R_(1) and R_(2) made from material A and B respectively . Have resistance of 200 Omega and 100 Omega at 0^(@)C . Show as a diagram the colour cube of a carbon resistance that would have a resistance equal to the series combination of r_(1) and R_(2) at a temperature of 100^(@)C (Neglect the ring corresponding to the tolerance of the carbon resistor)

    In the Ohm'slaw experiment to find resistance of unknown resistor R following arrangements (a) and (b) are possible The resistance measured is given by R_(measured)=(V)/(i) V = voltage reading of voltmeter I = current Reading of ammeter But unfortunately the ammeters and voltmeter used are not ideal but having resistance R_(A) and R_(v) respect tively Yor are given two unknown resistors X and Y These resistances are to be determind using an ammeter of R_(A) = 0.5Omega and a voltmeter of R_(v) = 20kOmega It is known that X is in range of a few ohms and Y is in the range of several kilo ohm's Which circuit is perferable to measure X and Y {:("Resistor",Circuit),(x,(a)),(y,(b)):} .

    A copper wire of length l and r radius r is nickel plated till its final radius is 2r. If the resistivity of the copper and nickel are rho_(c) and rho_(n) , then find the equivalent resistance of the wire.

    The temperature coefficient of resistivity for two materials A and B are 0.0031//""^@C , and 0.0068//""^@C respectively. Two resistors R_1 and R_2 , made from material A and B respectively, have resistances of 200 Omega and 100 Omega at 0^@C . Show the colour code of a carbon resistor that would have a resistance equal to the series combination of R_1 and R_2 at a temperature of 100^@C (Neglect the ring corresponding to the tolerance of the carbon resistor).

    Two planets have radii r_(1) and 2r_(1) and densities are rho_(1) and 4rho_(1) respectively. The ratio of their acceleration due to gravities is