In a wire of cross-section radius r, fre...

In a wire of cross-section radius `r`, free electrons travel with drift velocity `v` when a current `I` flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is `2v`?

`2I`

`I//2`

`I//4`

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

CURRENT ELECTRICITY
ERRORLESS |Exercise Kirchhoff s Law, cells|8 Videos
CURRENT ELECTRICITY
ERRORLESS |Exercise Different Measuring Instruments|1 Videos
COMMUNICATION SYSTEM
ERRORLESS |Exercise S E T|14 Videos
ELECTRO MAGNETIC INDUCTION
ERRORLESS |Exercise SET|20 Videos

Similar Questions

Explore conceptually related problems

The current i flows in a wire of circular cross-section with the free electrons travelling with a drift velocity v. What is the drift velocity of electrons when a current of 2 i flows in another wire of twice the radius and of the same material ?

A current flows in a wire of circular cross section with the free electrons travelling with drift velocity vecV . If an equal current flows in a wire of twice the radius, new drift velocity is

The drift velocity of free electrons in a conductor is v, when a current i is flowing in it, Ifboth the radius and current are doubled, then the drift velocity will be :

The drift velocity of free elecrons in a conductor is v , when a current i is flowing in it. If both the radius and current are doubled, then the drift velocity wil be

A current I flows through a uniform wire of diameter d when the mean electron drift velocity is v . The same current will flow though a wire of diameter d//2 made of the same material if the mean drift velocity of the electron is

Drift velocity of free electrons when current passes through the conductor is of the order of

When current is 4 A in a conductor the drift velocity is v_(d) When the current is 3 A the drift velocity will be

ERRORLESS -CURRENT ELECTRICITY-Self Evaluation Test -19

In a wire of cross-section radius r, free electrons travel with drift ...
Text Solution
|
Figure 6.51 shows a simple a potentiometer circuit for measuring a sma...
Text Solution
|
A car has a fresh storage battery of emf 12 V and internal resistance ...
Text Solution
|
If the balance point is obtained at the 35th cm in a metre bridge the ...
Text Solution
|
The equivalent resistance across the terminals of source of e.m.f. 24 ...
Text Solution
|
In the circuit shown in figure, switch S is initially closed and S i...
Text Solution
|
The figure here shows a portion of a circuit. What are the magnitude a...
Text Solution
|
A carbon resistor has colour strips as violet, yellow brown and golden...
Text Solution
|
A voltmeter of resistance 1000 Omega is connected across a resistance ...
Text Solution
|
A beam contains 2 xx 10^(8) doubly charged positive ions per cubic cen...
Text Solution
|
In the circuit shown, the reading of ammeter when switch S is open ...
Text Solution
|
In the circuit as shown in figure the
Text Solution
|
In figure shows a rectangular block with dimensions x , 2 x and 4 x ....
Text Solution
|
A battery is connected to a uniform resistance wire AB and B is eart...
Text Solution
|
A cylindrical metal wire of length l and cross sections area S , has...
Text Solution
|
A potential divider is used to give outputs of 4 V and 8 V from a 12 V...
Text Solution
|
Find equivalent resistance between A and B
Text Solution
|
Following figures show four situations in which positive and negative ...
Text Solution
|
A and B are two square plates of same metal and same thickness but len...
Text Solution
|
A moving coil galvanometer is converted into an ammeter reads upto 0.0...
Text Solution
|
Two conductors are made of the same material and have the same length....
Text Solution
|