Question

A conductor carries a very large number of free electron field no force when placed in a magentic field unless a current is passed through the conductor, why ?

Answer 1

$\bold{ANSWER}$

In a conductor carrying no current, all the free elcctrons move randomly so that their average velocity is zero. Since a magnetic field applies force on the charged párticle due to its velocity,
Therefore these electrons experience no force.
Now, on passing current through the free electrons acquire drift velocity in a definite direction, hence magnetic force acts on them.

$\bold{Thanks}$

Answer 2

We know,

1)Electric Current is the time rate if flow of charge carriers.

2)A current carying conductor has a large no. of free electrons that moves in a random zig zag manner.

Reasons=>>

1)A charge cannot leave an conductor and the magnetic field on charges moving in a conductor is transmitted to the conductor itself.

2)According to FLEMMING'S RIGHT HAND RULE the direction of flow of induced current is given by middle finger and other two fingers give the direction of force magnetic field.

3) According to FLEMMING'S LEFT HAND RULE, the direction if force is given by thumb finger and other two fingers show the direction of current and

magentic field.

4)So if current is not flowing in a conductor then it will experience no force thought there is magnetic field.

Since it doesn't satisfies the FLEMMING'S LEFT HAND RULE.

5)Also the magnetic field applies force on the charged particle only when they are moving or motile.

That is why they will not experience force in the magnetic field unless there is flow of electrons i.e Electricity.


thanks