Home
Class 12
PHYSICS
Assertion : Current flows in a conductor...

Assertion : Current flows in a conductor only when there is an external electric field within the conductor.
Reason: The drift velocity of the electrons is directly proportional to the electric field.

A

Statement-1 is True , Statement-2 is True , Statement-2 is a correct explanation for Statement-1.

B

Statement-1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-1.

C

Statement-1 is True , Statement-2 is False

D

Statement-1 is False , Statement-2 is True

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Similar Questions

Explore conceptually related problems

The average velocity of electrons in a conductor in the absence of electric field is

When current flows through a conductor, then the order of drift velocity of electrons will be

How does electric current flow along a conductor , when electric field is applied along the length of conductor ?

When a steady current passes through a cylindrical conductor, is there an electric field inside the conductor?

When a steady current passes through a cylindrical conductor, is there an electric field inside the conductor?

A current flows in a conductor from east to west. The direction of the magnetic field at a points above the conductor is

An electron enters an electric field with its velocity in the direction of the electric lines of force. Then

When a current flows through a conductor, its temperature

A currrent I is passed through a silver strip of width d and area of cross section A. The number of free electrons per unit volume is n. (a) Find the drift velocity v of the electrons. (b) If a magnetic field B exists in the region as shown in what is the average magnetic force on the free electrons? (c) Due to the magnetic force, the free electrons get accumulated on one side of the conductor along its length. This produces a transverse electric field in the conductor which opposes the magnetic force on the electrons. Find the magnitude of the electric field which will be the potential diference developed across the width of the conductor due to the electron- accumulation? The appearance of a transverse emf, when a current-carrying wire is placed in a magnetic field, is called hall effect.

Assertion: For good conductors, the I-V graph is a perfect straight line inclined to current axis. Reason: By Ohm's law, voltage across the ends of a conductor is directly proportional to the resistance of the conductor.