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How does magnetic field due to current c...

How does magnetic field due to current carrying conductor vary?

Text Solution

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(i) Magnitude of the magnetic field produced at a given point increases with increase in the current passing through the wire. This results into increased number of concentric circles representing magnetic lines of force.
(ii). Magnetic field produced by constant current in the wire decreases as the distance from the wire increases. Thus, the concentric circles representing the magnetic lines of force are shown bigger and rarefied as the distance from the wire increases.
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Knowledge Check

  • Assertion (A): Magnetic field due to a straight current carrying conductor is in the form of circular loops around it. Reason (R): The magnetic field due to a current carrying conductor is weak at near points from the conductor.

    A
    Both (A) and (R) are true and (R) is the correct explanation of (A).
    B
    Both (A) and (R) are true but (R) is not the correct explanation of (A).
    C
    (A) is true but (R) is false.
    D
    (A) is false and (R) is also false.

  • Direction of magnetic field produced by the current carrying conductor is given by :

    A
    right hand grip rule
    B
    left hand grip rule
    C
    Fleming's left hand rule
    D
    Fleming's right hand rule

  • The magnetic field near a current carrying conductor is given by

    A
    Coulomb’s law
    B
    Lenz’ law
    C
    Biot-savart’s law
    D
    Kirchoff’s law

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    State the factors on which the magnitude of the magnetic field due to a current-carrying conductor depends and how it depends.

    What happens to the magnetic field lines due to a current - carrying conductor when the current is reversed ?

    What happens to the magnetic field lines due to a current- carrying conductor when the current is reversed?

    How will the magentic field lines due to a current - carrying conductor be affected on inreasing the current in the conductor ?

    (a) How does the magnetic field (B) due to a straight conductor vary with distance (r) from it? (b) How does the magnetic field (B) vary inside a solenoid?

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