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

(a)`(rho_A) gt(rho_B)`

B

(b)`(rho_A)=(rho_B)`

C

(c ) `(rho_A)lt(rho_B)`

D

(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
Promotional Banner

Topper's Solved these Questions

  • ELECTRIC CURRENT IN CONDUCTORS

    HC VERMA|Exercise Objective 2|9 Videos
  • ELECTRIC CURRENT IN CONDUCTORS

    HC VERMA|Exercise Exercises|84 Videos
  • ELECTRIC CURRENT IN CONDUCTORS

    HC VERMA|Exercise Short Answer|17 Videos
  • DISPERSION AND SPECTRA

    HC VERMA|Exercise Exercises|11 Videos
  • ELECTRIC CURRENT THROUGH GASES

    HC VERMA|Exercise Exercises|23 Videos

Similar Questions

Explore conceptually related problems

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 system of binary stars of mass m_(A) and m_(B) are moving in circular orbits of radii r_(A) and r_(B) respectively. If T_(A) and T_(B) are at the time periods of masses m_(A) and m_(B) respectively then

A copper wire of length l and 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.

Two wires of equal length and equal diameter and having resisticities rho_(1) and rho_(2) are connected in series. The equivalent resistivity of the combination is .... .

Two wires of equal length and equal diameter and having resistivities rho_(1) and rho_(2) are connected in series. The equivalent resistivity of the combination is _______.

PQ is a current - carrying long straight conductor in the plane of the paper as shown in the following figure . A and B are two points at distance r_(1) and r_(2) from it . Mention the direction of the magnetic field produced by it at point A and B .

Two resistors of resistances R_(1)=100pm3 ohm and R_(2)=200pm4 ohm are connected (a) series , (b) in parallel. Find the equivalent resistance of the (a) series combination, (b) parallel combination. Use for (a) the relation R = R_(1)+R_(2) and for (b) (1)/(R') = (1)/(R_(1))+(1)/(R_(2)) and (DeltaR')/(R'^(2)) = (DeltaR_(1))/(R_(1)^(2))+(DeltaR_(2))/(R_(2))

When resistors of resistances R_1 and R_2 (R_2 lt R_1) are connected in parallel and the currents flowing through them are I_1 and I_2 respectively, then ……………. .

Two artificial satellites A and B are at a distance r_(A) and r_(B) above the earth's surface. If the radius of earth is R, then the ratio of their speed will be :-

Four rods of material X and three rods of material Y are connected as shown in figure. All the rods are of identical lengths and cross-sectional area. Given thermal resistance of rod of material X, R_(x) = R and thermal conductivities of materials are related by relation K_(Y) = 2K_(X) . {:(,"Column-I",,"Column-II"),((A),"Thermal resistance between B and E" ,(p),(500)/(13).^(@)C ),((B),"Thermal resistance between A and F" ,(q),(700)/(13).^(@)C ),((C),"Temperature of junction B" ,(r),(2R)/(3)), ((D),"Temperature of junction D" ,(s),(13R)/(6)):}