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NEET-XII-Physics

04: Moving Charges And Magnetism

Qstn# 5 Prvs-QstnNext-Qstn
  • #5
    What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30° with the direction of a uniform magnetic field of 0.15 T?
    Ans : Current in the wire, I = 8 A

    Magnitude of the uniform magnetic field, B = 0.15 T

    Angle between the wire and magnetic field, θ = 30°.

    Magnetic force per unit length on the wire is given as:

    f = BI sinθ

    = 0.15 × 8 ×1 × sin30°

    = 0.6 N m-1

    Hence, the magnetic force per unit length on the wire is 0.6 N m-1.