Home
Class 12
PHYSICS
Consider a conductor of variable cross s...

Consider a conductor of variable cross section in which current is flowing from cross section 1 to 2. Then

A

current passing through both the cross sections in the same

B

current through 1 is less then that through 2

C

drift velocity of electrons at 1 is less then that at 2

D

drift velocity is same at both the cross sections

Text Solution

Verified by Experts

The correct Answer is:
A, C
As the cross section are in series, so the current in them will
be the same. From `I = "ne"Av_(d),` we have `v_(d) prop 1//A.` As one cross
section is more, hence the drift velocity is less.
Promotional Banner

Topper's Solved these Questions

  • ELECTRIC CURRENT AND CIRCUIT

    CENGAGE PHYSICS ENGLISH|Exercise Comprehension|35 Videos

  • ELECTRIC CURRENT AND CIRCUIT

    CENGAGE PHYSICS ENGLISH|Exercise Interger|8 Videos

  • ELECTRIC CURRENT AND CIRCUIT

    CENGAGE PHYSICS ENGLISH|Exercise Single Correct|72 Videos

  • ELECTRIC CURRENT & CIRCUITS

    CENGAGE PHYSICS ENGLISH|Exercise Kirchhoff s law and simple circuits|15 Videos

  • ELECTRIC FLUX AND GAUSS LAW

    CENGAGE PHYSICS ENGLISH|Exercise MCQ s|38 Videos

Similar Questions

Explore conceptually related problems

A wire of radius R having uniform cross section in which steady current l is flowing. Then

A portion of a tube is shown in the figure. Fluid is flowing from cross-section area A_(1) to A_(2) . The two cross-sections are at distance 'l' from each other. The velocity of the fluid at section A_(2) is sqrt((gl)/(2)) . If the pressures at A_(1) & A_(2) are same, then the angle made by the tube with the horizontal will be:

Resistivity of a conductor of length l and cross - section A is rho . If its length is doubled and area of cross-section is halved, then its new resistivity will be .

Current is flowing through a wire of non-uniform cross section. Cross section of wire at A is les than the cross section of wire at B. Then match the following

Shown a conductor of length l having a circular cross section. The radius of cross section varies linearly form a to b . The resistivity of the material is (rho) .Assuming that b-altltl ,find the resistance of the conductor.

Water flows through a horizontal tube of variable cross section.The area of cross section at A and B are 4 mm^2 and 2mm^2 respectively. If 1 cc of water enters per second through A find a) The speed of water at A b) the speed of river at B c) the pressure difference P_A-P_B .

Water flows through a horizontal tube of variable cross-section. The area of cross section at A and B are 4 mm^2 and 2mm^2 respectively. If 1 cc of water enters per seconds through. A find a. The speed of water at A, b. the speed of river at B and c. the pressure difference P_A-P_B .

Consider the follwing three statmenet for a current carrying conductor of non-uniform cross-section. STATEMENT-1 : Current density at any cross -section of the conductor is proportional to electric field at the cross-section. STATEMENT-2 : If temperature of the conductor is increased, relaxation time of drifting electron decreases. STATEMENT-3 : Electrons in the conductor flow from low potential to high potential.

Two cylindrical conductors with equal cross-sections and different resistivites rho_(1) and rho_(2) are point end to end. Find the charge at the boundary of the conduction if a current I flows from conductor 1 to conductor 2

The length of a current-carrying cylindrical conductor is l, its area of cross-section is A, the number density of free electrons in it is n, and the drift velocity of electrons in it is v_d . The number of electrons passing through a particular cross-section of the conductor per unit time is given by: