Drift velocity of electrons in a conductor bearing potential difference V across its terminals is v. If the length of wire is stretched to three times

Question

Drift velocity of electrons in a conductor bearing potential difference V across its terminals is v. If the length of wire is stretched to three times

Drift velocity of electrons in a conductor bearing potential difference V across its terminals is v. If the length of wire is stretched to three times and same potential differece V is applied, then the drift velocity will become
A. `v/3`
B. `v/2`
C. `v/6`
D. v

Monjur Alahi

6 views

2025-01-04 04:42

1 Answers

Related Questions

If the length of a wire conductor is doubled by strctching it while keeping the potential difference constant, by what factor will the drift speed of

2 Answers 4 Views

A potential difference of 100 V is applied to the ends of a copper wire one metre long . What is the average drift velocity of electrons ? (Given, `si

2 Answers 4 Views

A potential difference is applied across the ends of a metallic wire. If the potential difference is doubled, the drift velocity will

2 Answers 4 Views

A wire is of lengths `l_(1)` and `l_(2)` when stretched by a force 4 N and 5 N respectively. Then the length of the wire when stretched by a force 7 N

2 Answers 4 Views

If A is the area of cross section of conductor, `v_(d)` is the drift velocity of electrons and n is the number of electrons per unit volume, then curr

2 Answers 4 Views

When a current I is set up in a wire of radius r, the drift velocity is `v_(d)`. If the same current is set up through a wire of radius 2r, the drift

2 Answers 4 Views

A metal wire of cross-sectional area `1m m^(2)` contains `5xx10^(22)` electrons per `cm^(3)` . If the electrons move along the wire with average drift

2 Answers 4 Views

If a wire of resistance `25Omega` is uniformly stretched until its length becomes three times its original length then its new resistance is

2 Answers 5 Views

A wire of resistance `12Omega` is stretched uniformly till its length becomes three times original length. The change in resistance of wire is

2 Answers 4 Views

A wire of resistance `4 Omega` is stretched to twice its original length. The resistance of stretched wire would be

2 Answers 4 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
When the wire is stretched to three times, resistance becomes 9 times and area becomes one third.
`:. I=(V)/(R)= n e A v_(d)`
`:.v_(d)=(V)/(R n e A) :.v_(d) prop (1)/(AR)`
`:.(v_(d1))/(v_(d2))=(A_(1)R_(1))/(A_(2)R_(2))=(AR)/((A//3)(9R))=(1)/(3)`
`:.v_(d2)=(v_(d1))/(3)=(v)/(3)`

6 views Answered 2023-02-05 15:29