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    CH-04 Moving Charges & Magnetism: Lect-01

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    harsh vardhan
    1) The document discusses Oersted's experiment which showed that a current-carrying wire produces a magnetic field around it. It also describes the right-hand rule for determining the direction of magnetic fields. 2) The Biot-Savart law is introduced, which calculates the magnetic field produced by a current element, analogous to Coulomb's law for electric fields from charges. 3) Examples are given for using the right-hand rule and Biot-Savart law to determine the direction and strength of magnetic fields from current-carrying wires.

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    CH-04 Moving Charges & Magnetism: Lect-01

    Uploaded by

    harsh vardhan
    25 views22 pages
    1) The document discusses Oersted's experiment which showed that a current-carrying wire produces a magnetic field around it. It also describes the right-hand rule for determining the direction of magnetic fields. 2) The Biot-Savart law is introduced, which calculates the magnetic field produced by a current element, analogous to Coulomb's law for electric fields from charges. 3) Examples are given for using the right-hand rule and Biot-Savart law to determine the direction and strength of magnetic fields from current-carrying wires.

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    CH-4--L-1

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    1) The document discusses Oersted's experiment which showed that a current-carrying wire produces a magnetic field around it. It also describes the right-hand rule for determining the direction of magnetic fields. 2) The Biot-Savart law is introduced, which calculates the magnetic field produced by a current element, analogous to Coulomb's law for electric fields from charges. 3) Examples are given for using the right-hand rule and Biot-Savart law to determine the direction and strength of magnetic fields from current-carrying wires.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    25 views22 pages

    CH-04 Moving Charges & Magnetism: Lect-01

    Uploaded by

    harsh vardhan
    1) The document discusses Oersted's experiment which showed that a current-carrying wire produces a magnetic field around it. It also describes the right-hand rule for determining the direction of magnetic fields. 2) The Biot-Savart law is introduced, which calculates the magnetic field produced by a current element, analogous to Coulomb's law for electric fields from charges. 3) Examples are given for using the right-hand rule and Biot-Savart law to determine the direction and strength of magnetic fields from current-carrying wires.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 22

    CH-04

    MOVING CHARGES &


    MAGNETISM
    Lect-01

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    Today’s Goal
    Oersted’s Experiment

    BIOT SAVART LAW

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    Oersted’s Experiment
    Observations
    1. A Magnetic Compass (or Magnetic Needle )
    shows deflection when placed near a current
    carrying wire.

    Magnetic Compass is deflected


    Magnetic Field.
    So, a current Carrying wire produces Magnetic
    Field around it

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    2. When the wire is held Over the needle
    and current flows from South to North ,
    the North pole of magnetic needle deflects
    towards West.

    3. If direction of current is reversed, the


    deflection, is also reversed.

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    4. If wire is held below the needle and
    current is from South to North , North
    Pole of needle deflects towards East.

    5. If direction of Current is reversed , the


    deflection is also reversed.

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    RIGHT HAND THUMB RULE

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    BIOT-SAVART LAW
    ➢ Calculation of Magnetic Field ( 𝑩 ) and it’s direction due to a
    current element.

    ➢Similar to Coloumb’s Law for Calculating Electric Field ( 𝑬 ) due to a


    charge element.

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    Magnetic Field due to Current Element:
    BIOT & SAVART’S LAW

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    Direction of ( 𝒅𝑩) Magnetic Field
    1. 𝒅𝒍 x 𝒓 or Screw Rule

    2. Right Hand Thumb Rule

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    Q ) Determine the direction od Magnetic Field at Point ‘P’ and ‘Q’ in following
    cases

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    NOTE:
    1. Magnetic Field is ZERO on the axis of current element.

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    Units of Magnetic Field Intensity

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    Q 1) A wire placed along the north-south direction carries a current of 8 A from
    south to north. Find the magnetic field due to a 1cm piece of wire at a point 200
    cm north-east from the piece.

    a) 2 x 10-9 T
    𝟏
    b) 𝟐
    x 10-9 T
    c) 3.14 x 10-9 T
    d) 1.41 x 10-9 T

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    Q 2) A wire placed along east-west direction carries a current 10 A from west to
    east direction. Determine the magnetic field due to 1.8 cm piece of wire at a
    point 300 cm north-east from the piece.

    a) 2 x 10-9 T inward
    b) 2 x 10-9 T outward
    c) 1.4 x 10-9 T inward
    d) 1.4 x 10-9 T outward

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    Q 3) An element ∆𝒍Ԧ = ∆𝒙 𝒊Ƹ is placed at the origin and carries a large current I=10
    A. What is the magnetic field on the y-axis at a distance of 0.5 m. ∆𝒙 = 1 cm.

    ෡
    a) 4 x 10-8 T (−𝒌)
    ෡
    b) 2 x 10-8 T (−𝒌)
    ෡
    c) 4 x 10-8 T (𝒌)
    ෡
    d) 2 x 10-8 T (𝒌)

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    Q 4) A small current element I 𝒅𝒍 , with 𝒅𝒍 = 2 𝒌෡ mm and I = 2A is centered at
    the origin. Find magnetic field 𝒅𝑩 at the following points:

    i. On the x-axis at x= 3m.

    ii. On the x-axis at x=-6 m.

    iii. On the z-axis at z=3 m.

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