JEE PYQ: Magnetic Effects Of Current Question 6
Question 6 - 2021 (18 Mar 2021 Shift 1)
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.
(1) Loop assumes circular shape with its plane normal to the field.
(2) Loop assumes circular shape with its plane parallel to the field.
(3) Wire gets stretched to become straight.
(4) Shape of the loop remains unchanged.
Show Answer
Answer: (1) Loop assumes circular shape with its plane normal to the field.
Solution
Every part ($d\ell$) of the wire is pulled by force $i(d\ell)B$ acting perpendicular to current and magnetic field, giving it a shape of circle.
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