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Can free electrons move in and out of th...

Can free electrons move in and out of the body?

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To answer the question "Can free electrons move in and out of the body?", we can break it down into a few key points: ### Step-by-Step Solution: 1. **Understanding Free Electrons**: - Free electrons are electrons that are not bound to any atom and can move freely within a material. They are typically found in conductive materials like metals. 2. **Body as a Conductor**: ...
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Can we say that all free electrons move in the same direction in a conductor when some potential difference is applied across it ?

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Knowledge Check

  • A straight conductor carries a current. Assume that all free electrons in the conductor move with the same drift velocity v . A and B are two observers on a striaght line XY parallel to the conductor. A is stationary B moves along XY with a velocity v in the direction of the free electrons.

    A
    `A` and `B` observe the same magnetic field.
    B
    `A` observes a magnetic field `B` does not.
    C
    `A` and `B` observe magnetic fiels of the same magnitude but opposite directions
    D
    `A` and `B` do not observe any electric field.

  • A variable force F acts on a body which is free to move. The displacement of the body is proportional to t^(3) , where t = time. The power delivered by F to the body will be proportional to

    A
    `t`
    B
    `t^(2)`
    C
    `t^(3)`
    D
    `t^(4)`

  • In a metal in the solid state, such as a copper wire, the atoms are strongly bound to one another and occupý fixed positions. Some electrons (called the conductor electrons) are free to move in the body of the metal while the other are strongly bound to their atoms. In good conductors, the number of free electrons is very large of the order of 10^(28) electrons per cubic metre in copper. The free electrons are in random motion and keep colliding with atoms. At room temperature, they move with velocities of the order of 10^5 m/s. These velocities are completely random and there is not net flow of charge in any directions. If a potential difference is maintained between the ends of the metal wire (by connecting it across a battery), an electric field is set up which accelerates the free electrons: These accelerated electrons frequently collide with the atoms of the conductor, as a result, they acquire a constant speed called the drift speed which is given by V_e = 1/enA where I = current in the conductor due to drifting electrons, e = charge of electron, n = number of free electrons per unit volume of the conductor and A = area of cross-section of the conductor. A uniform wire of length 2.0 m and cross-sectional area 10^(-7) m^(2) carries a current of 1.6 A. If there are 10^(28) free electrons per m in copper, the drift speed of electrons in copper is

    A
    `2 mm//s`
    B
    `5 mm//s`
    C
    `10 mm//s`
    D
    `1 m//s`

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    Explain free electron model of conduction.

    The free electrons of a metal are free to

    In a metal in the solid state, such as a copper wire, the atoms are strongly bound to one another and occupý fixed positions. Some electrons (called the conductor electrons) are free to move in the body of the metal while the other are strongly bound to their atoms. In good conductors, the number of free electrons is very large of the order of 10^(28) electrons per cubic metre in copper. The free electrons are in random motion and keep colliding with atoms. At room temperature, they move with velocities of the order of 10^5 m/s. These velocities are completely random and there is not net flow of charge in any directions. If a potential difference is maintained between the ends of the metal wire (by connecting it across a battery), an electric field is set up which accelerates the free electrons: These accelerated electrons frequently collide with the atoms of the conductor, as a result, they acquire a constant speed called the drift speed which is given by V_e = 1/enA where I = current in the conductor due to drifting electrons, e = charge of electron, n = number of free electrons per unit volume of the conductor and A = area of cross-section of the conductor. The drift speed of free electrons in a conductor depends upon

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