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JEE Main202118 Mar 2021Morning ShiftPhysicsMagnetic Effects of CurrentActual

A loop of flexible wire of irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire.

Options

  1. ALoop assumes circular shape with its plane normal to the field.
  2. BLoop assumes circular shape with its plane parallel to the field.
  3. CWire gets stretched to become straight.
  4. DShape of the loop remains unchanged.

Correct answer

A. Loop assumes circular shape with its plane normal to the field.

Step-by-step solution

Every part ( d l ) of the wire is pulled by the force i ( d l ) B acting perpendicular to the current & magnetic field giving it the shape of a circle.

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