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Magnetic Fields due to Electric Current — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Fields due to Electric Current1 Mark
MCQ
Torque acting on a rectangular coil carrying current $I$ situated parallel to magnetic field of induction $B$ having number of turns $n$ and area $A$ is
  • A
    $n I(\hat{A} \cdot \hat{B})$
  • B
    $\frac{n B A}{I}$
  • C
    $n I(\vec{A} \times \vec{B})$
  • D
    $\frac{I B A}{n}$
✓

Answer

(c) Torque acting on a rectangular coil carrying current list = $\vec{\tau}=\vec{m} \times \vec{B}$ 
Now, for the coil having n number of turns and area A. we can write that $\vec{m}=n I \vec{A}$
So, torque, $\vec{\tau}=n I(\vec{A} \times \vec{B})$

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