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Magnetic Fields due to Electric Current — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Fields due to Electric Current1 Mark
MCQ
A loop of flexible wire or irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire.
  • A
    loop assumes circular shape with its plane normal to the field
  • B
    wire gets stretched to become straight
  • C
    loop assumes circular shape with its plane parallel to the field
  • D
    shape of the loop remains unchanged
✓

Answer

(a) : When a current carrying conductor is placed in external magnetic field, it will experience a force in the direction of $(I d \vec{l} \times \vec{B})$ on each small wire segment, force will be radially, outward, so wire will take the shape of circle with its plane normal to the field.

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