Question

When a wire carries a current of 1.2 A, the drift speed is 1.2 × 10^-4 ms^-1. If the current in the wire is 6A, then the drift speed is ​

Answer 1

Explanation:

Answer :

A::D

Solution :

ltbr.<br> when current has increased fromto

Answer 2

Answer:

HOPE IT HELPS PLEASE MARK ME BRAINLIEST

Explanation:

Given

Initial current through the wire is I=1A

Initial drift velocity is, v d  =1.2×10^−4  ms^ −1

 Increased current is, I′ =5A

The current, I through the wire is given by

I=μe .e .A. v d

​

where, μe  is the free electron density, e is the charge on electron, A is the area of cross section of the wire and v---d is the drift velocity of electrons.  

Since,  the free electron density, the charge on electron and the area of cross section of the wire are constant, hence

I ∝ v d  :- (1)

Now, current though the wire is increased to 5 A, if the new drift velocity of electrons is v' d  then

I′ ∝v' d   :- (2)

From (1) and (2), we can write

v' d  / v' d =  I'/ I  

 

​ v' d  =I'/I   v d

​

 v' d =  5/1×1.2 ×10^−4

 

v' d =6×10^−4  ms ^−1