A magnetic dipole is placed at right angles to the direction of lines of force of magnetic induction B. If it is rotated through an angle of 180°, then the work done is

Question

A magnetic dipole is placed at right angles to the direction of lines of force of magnetic induction B. If it is rotated through an angle of 180°, then the work done is (A) 2 MB (B) MB (C) - 2 MB (D) Zero

Tardigrade Admin · Accepted Answer

Ui=-M B cos 90° Uf=-M B cos 90° W=0-0=0

Q. A magnetic dipole is placed at right angles to the direction of lines of force of magnetic induction $B$ . If it is rotated through an angle of $18 0^{\circ}$ , then the work done is

2 MB

MB

- 2 MB

Zero

$U_{i} = - MB cos 9 0^{\circ}$
$U_{f} = - MB cos 9 0^{\circ}$
$W = 0 - 0 = 0$

Q. A magnetic dipole is placed at right angles to the direction of lines of force of magnetic induction B. If it is rotated through an angle of 180∘, then the work done is

2 MB

MB

- 2 MB

Zero

Ui​=−MBcos90∘ Uf​=−MBcos90∘ W=0−0=0

Q. A magnetic dipole is placed at right angles to the direction of lines of force of magnetic induction $B$ . If it is rotated through an angle of $18 0^{\circ}$ , then the work done is

$U_{i} = - MB cos 9 0^{\circ}$
$U_{f} = - MB cos 9 0^{\circ}$
$W = 0 - 0 = 0$