AP EAMCET · PHYSICS · Magnetic Effects of Current
Given figure shows the north and south poles of a permanent magnet in which a coil of \(n\) turns of cross-sectional area \(A\) is resting, such that when a current \(I\) is passed through the coil, the plane of the coil makes and angle \(\theta\) with respect to direction of magnetic field \(B\). If the plane of magnetic field and the coil are horizontal and vertical respectively, the torque on the coil will be
- A \(n l A B \cos \theta\)
- B \(n / A B \sin \theta\)
- C \(n l A B\)
- D None of the above, since the magnetic field is radial
Answer & Solution
Correct Answer
(C) \(n l A B\)
Step-by-step Solution
Detailed explanation
According to question, torque acting on the coil in magnetic field \(B\) is given as \(\tau=n I A B \sin \theta\) When the plane of magnetic field and the coil are horizontal and vertical respectively, then normal of coil makes \(90^{\circ}\) with the direction of magnetic…
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