JEE Main 2022 · 30 Jul · Shift 2 · Physics Q15

← JEE Main 2022 · 30 Jul · Shift 2

PhysicsSingle correct+4 / -1Question 15 of 90

A wire of length 8 m is bent to form a circular loop in y-z plane. A current of 0.5 A is flowing in anticlockwise direction in it, the magnetic dipole moment of the loop is:

-8\hat i

A m

^2

\dfrac8\pi\hat i

A m

^2

-4\pi\hat i

A m

^2

4\pi\hat i

A m

^2

Answer and worked solution

Official answer: B

Radius $\frac8{2\pi}=\frac4\pi$ m, area $\frac{16}\pi$ m². $m=IA=\frac8\pi$ A m², along $+\hat i$ for an anticlockwise loop in the y-z plane.

(B)

Topics:Magnetic dipole and bar magnet Torque on a current loop

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JEE Main 2022 · 30 Jul · Shift 2, Physics question 15