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Class 12 Physics Practice Test: Torque on Current Loop & Magnetic Dipole
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Class 12 Physics Practice Test: Torque on Current Loop & Magnetic Dipole
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10 Questions

1. Identify the factor on which the torque on a planar current loop does not depend.
2. Give the SI unit of magnetic dipole moment.
3. What torque acts on a 50 turn coil of 200 cm2 area carrying a current of 20 A held with its axis at right angles to a uniform magnetic field of 0.2T?
4. Under which of these conditions, the torque acting on the current-carrying loop is minimum?
5. Give the SI unit of magnetic pole strength.
6. The factor \((\frac {eh}{4\pi m_e})\) is the least value of the magnetic moment. This natural unit of magnetic moment is called Planck’s constant.
7. Under which of these conditions, the torque acting on the current carrying loop is minimum?
8. What is the maximum torque on a rectangular coil of area 4 cm × 80 cm of 400 turns, when carrying a current of 103 A in a magnetic field of 0.2 T?
9. Calculate the torque on a 500 turn rectangular coil of length 20 cm and breadth 10 cm, carrying a current of 30 A, when placed making an angle of 60o with a magnetic field of 0.5 T?
10. ‘X’ is the product of the pole strength of either magnetic pole and the magnetic length of the magnetic dipole. Identify X.

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