Magnetic Effect of Current Formulae For NEET

When current is passed through the conductor it will produce a magnetic effect around it, so basically the wire acts like a magnet, and it will interact with the permanent magnet you have placed next to it, this effect can be reversed by changing the direction of the current, which according to the rule changes the direction of the magnetic field produced by it.

Magnetic effect of current

  1. Magnetic field due to a moving point charge

    magneic field due to a moving point charge

    μo ≡ 4π × 10-7 N·s2/C2 is called the permeability of free space

  2. Biot- savart’s Law: This law states that the magnetic field (dB) at point P due to small current element Idl of the current-carrying conductor is directly proportional to the Idl (current) element of the conductor

    Biot Savart law

    Biot Savart law

  3. Magnetic field due to a straight wire

    magnetic field due to straight wire

    magnetic field due to straight wire

  4. Magnetic field due to an infinite straight line

    Magnetic field due to an infinite straight line

    Magnetic field due to an infinite straight line

  5. Magnetic field due to a circular loop

    Magnetic field due to a circular loop

    i) At centre

    B= μ0NI/2r

    ii) At axis

    Magnetic field due to a circular loop

  6. Magnetic field on the axis of a solenoid

    Magnetic field on the axis of a solenoid

    B = (μ0NI/2) (cos θ1 – cos θ2)

  7. Amperes Law

    Amperes Law

  8. Magnetic field due to a long cylinder

    Magnetic field due to a long cylinder

    i) B= 0, r < R

    ii) B = μ0I/2πr, r ≥ R

  9. Magnetic force acting on a moving point charge

    Magnetic force acting on a moving point charge

    Magnetic force acting on a moving point charge

  10. Magnetic force acting on a current-carrying wire

    Magnetic force acting on a current-carrying wire

  11. Magnetic Moment of a current carrying loop

    M = NIA

  12. The torque acting on a loop

    torque acting on a loop

  13. Magnetic field due to single pole

    B = (μ0/2π) m/r2

  14. Magnetic field on the axis of the magnet

    B = (μ0/4π) 2M/r3

  15. Magnetic field on the equatorial axis of the magnet

    B = (μ0/4π) M/r3

  16. Magnetic field at the point P of the magnet

    Magnetic field at the point P of the magnet

    Magnetic field at the point P of the magnet