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JEE Main 202118 MarchMorning Shift
Exam
JEE Main
Year
2021
Date
18 March
Shift
Morning Shift
Subject
Physics
Chapter
Magnetic Effects of Current

JEE Main 2021 · 18 March · Morning Shift · Physics · Magnetic Effects of Current

A loop of flexible wire of irregular shape carrying current is...

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 (dldl ) of the wire is pulled by the force i(dl)Bi ( dl ) B acting perpendicular to the current && magnetic field giving it the shape of a circle.
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